v3.26.1
Consolidated Schedule of Investments (Parenthetical)
€ in Thousands, £ in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
USD ($)
investment
agreement
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
investment
agreement
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
investment
agreement
Jun. 30, 2026
EUR (€)
investment
agreement
Jun. 30, 2026
GBP (£)
investment
agreement
Dec. 31, 2025
EUR (€)
investment
agreement
Dec. 31, 2025
GBP (£)
investment
agreement
Sep. 30, 2023
USD ($)
Sep. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
May 03, 2013
USD ($)
Number of collateralized agreements | agreement 1   1   1 1 1 1 1        
Cost basis of securities purchased under collateralized agreements to resell $ 30,000   $ 30,000   $ 30,000                
Fair value of securities purchased under collateralized agreements to resell 5,700   5,700   13,500                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [1]     2,742,013                    
Net Change In Unrealized Appreciation (Depreciation) 37,816 $ (40,078) (3,841) $ (89,005)                  
Fair value, ending balance 2,289,805 [2]   2,289,805 [2]   $ 2,742,013 [1]                
Net Realized Gains (Losses) $ (44,984) 13,389 $ (76,994) 51,214                  
Investments at fair value that are non-qualifying assets as a percentage of total assets 19.70%   19.70%   15.40% 19.70% 19.70% 15.40% 15.40%        
Non-controlled/Affiliated                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance     $ 60,702 [3] 112,776 $ 112,776                
Gross additions     3,119 [4]   6,967 [5]                
Gross redemptions     0 [6]   0 [7]                
Net Change In Unrealized Appreciation (Depreciation)     6,132   (59,041)                
Fair value, ending balance $ 69,953 [8]   69,953 [8]   60,702 [3]                
Net Realized Gains (Losses)     0   0                
Interest Income     3,079   5,678                
Dividend Income     1,401   2,594                
Other Income 62 62 125 125 250                
Controlled                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance     679,005 [9] 700,896 700,896                
Gross additions     22,847 [10]   101,498 [11]                
Gross redemptions     (93,451) [12]   (60,582) [13]                
Net Change In Unrealized Appreciation (Depreciation)     21,842   (62,807)                
Fair value, ending balance 630,243 [14]   630,243 [14]   679,005 [9]                
Net Realized Gains (Losses)     (18,591)   38,898                
Interest Income     8,130   20,584                
Dividend Income     29,224   58,436                
Other Income 474 $ 375 849 2,203 2,953                
Investment, Identifier [Axis]: AAC Lender Holdings, LLC | Ordinary Shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[17] 0   0                    
Investment, Identifier [Axis]: AAC Lender Holdings, LLC | Ordinary shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [18],[19],[20]     0                    
Fair value, ending balance [18],[19],[20]         0                
Investment, Identifier [Axis]: AAH Topco, LLC | First lien - Undrawn                          
Principal Amount or Par Value 3,659 [15],[16],[21],[22]   3,659 [15],[16],[21],[22]   3,659 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [19],[20],[24]                
Investment, Identifier [Axis]: AAH Topco, LLC | First lien 1                          
Principal Amount or Par Value $ 9,451 [15],[21],[25]   $ 9,451 [15],[21],[25]   $ 22,502 [19],[23],[26],[27]                
Spread 5.25% [15],[25]   5.25% [15],[25]   5.25% [19],[26],[27] 5.25% [15],[25] 5.25% [15],[25] 5.25% [19],[26],[27] 5.25% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 22,502                    
Fair value, ending balance $ 9,451 [15],[25]   9,451 [15],[25]   $ 22,502 [19],[26],[27]                
Investment, Identifier [Axis]: AAH Topco, LLC | First lien 2                          
Principal Amount or Par Value $ 7,263 [15],[21],[25]   $ 7,263 [15],[21],[25]   $ 20,009 [19],[20],[23],[28]                
Spread 5.25% [15],[25]   5.25% [15],[25]   5.25% [19],[20],[28] 5.25% [15],[25] 5.25% [15],[25] 5.25% [19],[20],[28] 5.25% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 20,009                    
Fair value, ending balance $ 7,263 [15],[25]   7,263 [15],[25]   $ 20,009 [19],[20],[28]                
Investment, Identifier [Axis]: AAH Topco, LLC | First lien 3                          
Principal Amount or Par Value $ 5,971 [15],[21],[29],[30]   $ 5,971 [15],[21],[29],[30]   $ 9,500 [19],[23],[31]                
Spread 5.25% [15],[29],[30]   5.25% [15],[29],[30]   5.25% [19],[31] 5.25% [15],[29],[30] 5.25% [15],[29],[30] 5.25% [19],[31] 5.25% [19],[31]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[31]     $ 9,500                    
Fair value, ending balance $ 5,971 [15],[29],[30]   5,971 [15],[29],[30]   $ 9,500 [19],[31]                
Investment, Identifier [Axis]: AAH Topco, LLC | First lien 4                          
Principal Amount or Par Value $ 3,491 [15],[16],[21],[32]   $ 3,491 [15],[16],[21],[32]   $ 7,300 [19],[23],[31]                
Spread 5.25% [15],[16],[32]   5.25% [15],[16],[32]   5.25% [19],[31] 5.25% [15],[16],[32] 5.25% [15],[16],[32] 5.25% [19],[31] 5.25% [19],[31]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[31]     $ 7,300                    
Fair value, ending balance $ 3,491 [15],[16],[32]   3,491 [15],[16],[32]   $ 7,300 [19],[31]                
Investment, Identifier [Axis]: AAH Topco, LLC | Subordinated 1                          
Principal Amount or Par Value 7,327 [15],[21],[25]   7,327 [15],[21],[25]   17,649 [19],[20],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     17,418                    
Fair value, ending balance 7,241 [15],[25]   7,241 [15],[25]   17,418 [19],[20],[28]                
Investment, Identifier [Axis]: AAH Topco, LLC | Subordinated 2                          
Principal Amount or Par Value 874 [15],[16],[21],[32]   874 [15],[16],[21],[32]   6,921 [19],[23],[31]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[31]     6,831                    
Fair value, ending balance 864 [15],[16],[32]   864 [15],[16],[32]   $ 6,831 [19],[31]                
Investment, Identifier [Axis]: ACI Group Holdings, Inc. | First lien                          
Number of investments held | investment         2     2 2        
Investment, Identifier [Axis]: ACI Group Holdings, Inc. | First lien - Drawn                          
Principal Amount or Par Value [19],[20],[23],[24]         $ 2,330                
Spread [19],[20],[24]         5.50%     5.50% 5.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     1,864                    
Fair value, ending balance [19],[20],[24]         $ 1,864                
Investment, Identifier [Axis]: ACI Group Holdings, Inc. | First lien - Undrawn                          
Principal Amount or Par Value [19],[20],[23],[24],[33]         24                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24],[33]     (5)                    
Fair value, ending balance [19],[20],[24],[33]         (5)                
Investment, Identifier [Axis]: ACI Group Holdings, Inc. | First lien 1                          
Principal Amount or Par Value [19],[23],[26],[27]         $ 22,643                
Spread [19],[26],[27],[34]         2.75%     2.75% 2.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     18,114                    
Fair value, ending balance [19],[26],[27]         $ 18,114                
Investment, Identifier [Axis]: ACI Group Holdings, Inc. | First lien 2                          
Principal Amount or Par Value [19],[20],[23],[28]         $ 4,346                
Spread [19],[20],[28],[34]         2.75%     2.75% 2.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     3,477                    
Fair value, ending balance [19],[20],[28]         $ 3,477                
Investment, Identifier [Axis]: ACI Group Holdings, Inc. | First lien 3                          
Principal Amount or Par Value [19],[20],[23],[28]         $ 4,014                
Spread [19],[20],[28],[34]         2.75%     2.75% 2.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     3,211                    
Fair value, ending balance [19],[20],[28]         $ 3,211                
Investment, Identifier [Axis]: ACI Parent Inc. | Preferred shares                          
Principal Amount or Par Value         20,249                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[33]     2,087                    
Fair value, ending balance [19],[20],[33]         2,087                
Investment, Identifier [Axis]: AI Altius US Bidco, Inc. | First lien                          
Principal Amount or Par Value [19],[20],[23],[28]         $ 3,062                
Spread [19],[20],[28]         4.75%     4.75% 4.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     3,062                    
Fair value, ending balance [19],[20],[28]         $ 3,062                
Investment, Identifier [Axis]: AI Altius US Bidco, Inc. | First lien - Undrawn                          
Principal Amount or Par Value [19],[20],[23],[24]         3,077                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance [19],[20],[24]         0                
Investment, Identifier [Axis]: AWP Group Holdings, Inc. | First lien - Drawn                          
Principal Amount or Par Value [15],[16],[21],[22],[32] $ 359   $ 359                    
Spread [15],[16],[22],[32] 5.25%   5.25%     5.25% 5.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22],[32] $ 358   $ 358                    
Investment, Identifier [Axis]: AWP Group Holdings, Inc. | First lien - Undrawn                          
Principal Amount or Par Value [15],[16],[21],[22] 1,005   1,005                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] (4)   (4)                    
Investment, Identifier [Axis]: AWP Group Holdings, Inc. | First lien 1                          
Principal Amount or Par Value [15],[21],[29],[30] $ 8,660   $ 8,660                    
Spread [15],[29],[30],[35] 2.63%   2.63%     2.63% 2.63%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[29],[30] $ 8,628   $ 8,628                    
Investment, Identifier [Axis]: Acumatica Holdings, Inc. | First lien                          
Principal Amount or Par Value $ 13,759 [15],[21],[29],[30]   $ 13,759 [15],[21],[29],[30]   $ 39,188 [19],[23],[26],[27]                
Spread 4.50% [15],[29],[30]   4.50% [15],[29],[30]   4.75% [19],[26],[27] 4.50% [15],[29],[30] 4.50% [15],[29],[30] 4.75% [19],[26],[27] 4.75% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 39,188                    
Fair value, ending balance $ 13,713 [15],[29],[30]   13,713 [15],[29],[30]   $ 39,188 [19],[26],[27]                
Investment, Identifier [Axis]: Acumatica Holdings, Inc. | First lien - Undrawn                          
Principal Amount or Par Value 9,403 [15],[16],[21],[22]   9,403 [15],[16],[21],[22]   9,403 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance (31) [15],[16],[22]   (31) [15],[16],[22]   0 [19],[20],[24]                
Investment, Identifier [Axis]: Adelaide Borrower, LLC | First lien                          
Principal Amount or Par Value $ 4,780 [15],[16],[21],[32]   $ 4,780 [15],[16],[21],[32]   $ 4,780 [19],[20],[23],[28]                
Spread 6.00% [15],[16],[32]   6.00% [15],[16],[32]   3.38% [19],[20],[28],[34] 6.00% [15],[16],[32] 6.00% [15],[16],[32] 3.38% [19],[20],[28],[34] 3.38% [19],[20],[28],[34]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 4,780                    
Fair value, ending balance $ 4,748 [15],[16],[32]   4,748 [15],[16],[32]   $ 4,780 [19],[20],[28]                
Investment, Identifier [Axis]: Adelaide Borrower, LLC | First lien - Drawn                          
Principal Amount or Par Value $ 53 [15],[16],[21],[22],[32]   $ 53 [15],[16],[21],[22],[32]   $ 120 [19],[20],[23],[24],[28]                
Spread 6.00% [15],[16],[22],[32]   6.00% [15],[16],[22],[32]   6.25% [19],[20],[24],[28] 6.00% [15],[16],[22],[32] 6.00% [15],[16],[22],[32] 6.25% [19],[20],[24],[28] 6.25% [19],[20],[24],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24],[28]     $ 120                    
Fair value, ending balance $ 53 [15],[16],[22],[32]   53 [15],[16],[22],[32]   $ 120 [19],[20],[24],[28]                
Investment, Identifier [Axis]: Adelaide Borrower, LLC | First lien - Undrawn 1                          
Principal Amount or Par Value 613 [15],[16],[21],[22]   613 [15],[16],[21],[22]   1,048 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance (4) [15],[16],[22]   (4) [15],[16],[22]   0 [19],[20],[24]                
Investment, Identifier [Axis]: Adelaide Borrower, LLC | First lien - Undrawn 2                          
Principal Amount or Par Value 1,048 [15],[16],[21],[22]   1,048 [15],[16],[21],[22]   547 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance (7) [15],[16],[22]   (7) [15],[16],[22]   0 [19],[20],[24]                
Investment, Identifier [Axis]: Alegeus Technologies Holdings Corp. | First lien                          
Principal Amount or Par Value $ 8,170 [16],[21],[32]   $ 8,170 [16],[21],[32]   $ 8,382 [19],[20],[23],[28]                
Spread 6.50% [16],[32]   6.50% [16],[32]   6.50% [19],[20],[28] 6.50% [16],[32] 6.50% [16],[32] 6.50% [19],[20],[28] 6.50% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 8,382                    
Fair value, ending balance $ 8,170 [16],[32]   $ 8,170 [16],[32]   $ 8,382 [19],[20],[28]                
Investment, Identifier [Axis]: Ambrosia Holdco Corp. | First lien                          
Number of investments held | investment 2   2     2 2            
Investment, Identifier [Axis]: Ambrosia Holdco Corp. | Subordinated                          
Number of investments held | investment 2   2     2 2            
Investment, Identifier [Axis]: Ambrosia Topco LLC | Class A-1 Common Units 1                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[30] $ 349   $ 349                    
Investment, Identifier [Axis]: Ambrosia Topco LLC | Class A-1 Common Units 2                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16] 337   337                    
Investment, Identifier [Axis]: Ambrosia Topco LLC | Class A-1 common units 1                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[27]     590                    
Fair value, ending balance [19],[27]         590                
Investment, Identifier [Axis]: Ambrosia Topco LLC | Class A-1 common units 2                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20]     569                    
Fair value, ending balance [19],[20]         569                
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc. | First lien - Undrawn                          
Principal Amount or Par Value 1,969 [15],[16],[21],[22]   1,969 [15],[16],[21],[22]   1,969 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     (15)                    
Fair value, ending balance (109) [15],[16],[22]   (109) [15],[16],[22]   (15) [19],[20],[24]                
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc. | First lien 1                          
Principal Amount or Par Value $ 18,672 [15],[16],[21],[32]   $ 18,672 [15],[16],[21],[32]   $ 18,769 [19],[20],[23],[28]                
Spread 5.50% [15],[16],[32]   5.50% [15],[16],[32]   5.50% [19],[20],[28] 5.50% [15],[16],[32] 5.50% [15],[16],[32] 5.50% [19],[20],[28] 5.50% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 18,626                    
Fair value, ending balance $ 17,635 [15],[16],[32]   17,635 [15],[16],[32]   $ 18,626 [19],[20],[28]                
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc. | First lien 2                          
Principal Amount or Par Value $ 5,196 [15],[21],[29],[30]   $ 5,196 [15],[21],[29],[30]   $ 5,223 [19],[23],[26],[27]                
Spread 5.50% [15],[29],[30]   5.50% [15],[29],[30]   5.50% [19],[26],[27] 5.50% [15],[29],[30] 5.50% [15],[29],[30] 5.50% [19],[26],[27] 5.50% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 5,183                    
Fair value, ending balance $ 4,908 [15],[29],[30]   4,908 [15],[29],[30]   $ 5,183 [19],[26],[27]                
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc. | First lien 3                          
Principal Amount or Par Value $ 682 [15],[16],[21],[32]   $ 682 [15],[16],[21],[32]   $ 686 [19],[20],[23],[28]                
Spread 5.50% [15],[16],[32]   5.50% [15],[16],[32]   5.50% [19],[20],[28] 5.50% [15],[16],[32] 5.50% [15],[16],[32] 5.50% [19],[20],[28] 5.50% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 681                    
Fair value, ending balance $ 645 [15],[16],[32]   645 [15],[16],[32]   $ 681 [19],[20],[28]                
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.) | First lien                          
Principal Amount or Par Value $ 31,406   $ 31,406                    
Number of investments held | investment 2   2   2 2 2 2 2        
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.) | First lien - Undrawn                          
Principal Amount or Par Value $ 2,652 [15],[16],[17],[21],[22]   $ 2,652 [15],[16],[17],[21],[22]   $ 2,652 [18],[19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [18],[19],[20],[24]     0                    
Fair value, ending balance 0 [15],[16],[17],[22]   0 [15],[16],[17],[22]   0 [18],[19],[20],[24]                
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.) | First lien 1                          
Principal Amount or Par Value $ 29,879 [15],[16],[21],[32]   $ 29,879 [15],[16],[21],[32]   $ 29,879 [19],[20],[23],[28]                
Spread 0.50% [15],[16],[32],[35],[36]   0.50% [15],[16],[32],[35],[36]   0.50% [19],[20],[28],[34],[37] 0.50% [15],[16],[32],[35],[36] 0.50% [15],[16],[32],[35],[36] 0.50% [19],[20],[28],[34],[37] 0.50% [19],[20],[28],[34],[37]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 17,999                    
Fair value, ending balance $ 16,000 [15],[16],[32]   16,000 [15],[16],[32]   $ 17,999 [19],[20],[28]                
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.) | First lien 2                          
Principal Amount or Par Value $ 1,527 [15],[16],[21]   $ 1,527 [15],[16],[21]   $ 1,527 [19],[20],[23]                
Spread 0.50% [15],[16],[35],[36]   0.50% [15],[16],[35],[36]   0.50% [19],[20],[34],[37] 0.50% [15],[16],[35],[36] 0.50% [15],[16],[35],[36] 0.50% [19],[20],[34],[37] 0.50% [19],[20],[34],[37]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20]     $ 0                    
Fair value, ending balance $ 0 [15],[16]   0 [15],[16]   $ 0 [19],[20]                
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.) | First lien | Non-accrual status                          
Principal Amount or Par Value                   $ 17,927 $ 13,479    
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.) | Subordinated                          
Principal Amount or Par Value 5,230 [15],[16],[21]   5,230 [15],[16],[21]   5,230 [19],[20],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20]     0                    
Fair value, ending balance 0 [15],[16]   0 [15],[16]   0 [19],[20]                
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.) | Subordinated | Non-accrual status                          
Principal Amount or Par Value                       $ 5,230  
Investment, Identifier [Axis]: Anaplan, Inc. | First lien                          
Principal Amount or Par Value [19],[23],[26],[27]         $ 10,513                
Spread [19],[26],[27]         4.50%     4.50% 4.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     10,513                    
Fair value, ending balance [19],[26],[27]         $ 10,513                
Investment, Identifier [Axis]: Associations, Inc. | First lien                          
Principal Amount or Par Value $ 29,871 [15],[16],[21],[32]   $ 29,871 [15],[16],[21],[32]   $ 48,932 [19],[20],[23],[28]                
Spread 6.50% [15],[16],[32]   6.50% [15],[16],[32]   6.50% [19],[20],[28] 6.50% [15],[16],[32] 6.50% [15],[16],[32] 6.50% [19],[20],[28] 6.50% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 48,932                    
Fair value, ending balance $ 29,871 [15],[16],[32]   29,871 [15],[16],[32]   $ 48,932 [19],[20],[28]                
Investment, Identifier [Axis]: Associations, Inc. | First lien - Drawn                          
Principal Amount or Par Value $ 2,010 [15],[16],[21],[22]   $ 2,010 [15],[16],[21],[22]   $ 1,639 [19],[20],[23],[24]                
Spread 6.50% [15],[16],[22]   6.50% [15],[16],[22]   6.50% [19],[20],[24] 6.50% [15],[16],[22] 6.50% [15],[16],[22] 6.50% [19],[20],[24] 6.50% [19],[20],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     $ 1,639                    
Fair value, ending balance $ 2,010 [15],[16],[22]   2,010 [15],[16],[22]   $ 1,639 [19],[20],[24]                
Investment, Identifier [Axis]: Associations, Inc. | First lien - Undrawn 1                          
Principal Amount or Par Value 1,806 [15],[16],[21],[22]   1,806 [15],[16],[21],[22]   2,186 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [19],[20],[24]                
Investment, Identifier [Axis]: Associations, Inc. | First lien - Undrawn 2                          
Principal Amount or Par Value 3,077 [15],[16],[21],[22]   3,077 [15],[16],[21],[22]   3,077 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [19],[20],[24]                
Investment, Identifier [Axis]: Associations, Inc. | Subordinated 1                          
Principal Amount or Par Value 9,842 [15],[16],[21]   9,842 [15],[16],[21]   9,173 [19],[20],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20]     9,356                    
Fair value, ending balance 9,842 [15],[16]   9,842 [15],[16]   9,356 [19],[20]                
Investment, Identifier [Axis]: Associations, Inc. | Subordinated 2                          
Principal Amount or Par Value 3,758 [15],[16],[21]   3,758 [15],[16],[21]   3,503 [19],[20],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20]     3,593                    
Fair value, ending balance 3,758 [15],[16]   3,758 [15],[16]   3,593 [19],[20]                
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd | First lien - Undrawn                          
Principal Amount or Par Value 790 [15],[16],[21],[22],[38]   790 [15],[16],[21],[22],[38]   790 [19],[20],[23],[24],[39]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24],[39]     0                    
Fair value, ending balance (16) [15],[16],[22],[38]   (16) [15],[16],[22],[38]   0 [19],[20],[24],[39]                
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd | First lien 1                          
Principal Amount or Par Value $ 4,441 [15],[21],[29],[30]   $ 4,441 [15],[21],[29],[30]   $ 4,463 [19],[23],[26],[27]                
Spread 4.50% [15],[29],[30]   4.50% [15],[29],[30]   4.75% [19],[26],[27] 4.50% [15],[29],[30] 4.50% [15],[29],[30] 4.75% [19],[26],[27] 4.75% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 4,463                    
Fair value, ending balance $ 4,352 [15],[29],[30]   4,352 [15],[29],[30]   $ 4,463 [19],[26],[27]                
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd | First lien 2                          
Principal Amount or Par Value $ 3,393 [15],[16],[21],[32]   $ 3,393 [15],[16],[21],[32]   $ 3,411 [19],[20],[23],[28]                
Spread 4.50% [15],[16],[32]   4.50% [15],[16],[32]   4.75% [19],[20],[28] 4.50% [15],[16],[32] 4.50% [15],[16],[32] 4.75% [19],[20],[28] 4.75% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 3,411                    
Fair value, ending balance $ 3,325 [15],[16],[32]   3,325 [15],[16],[32]   $ 3,411 [19],[20],[28]                
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd | First lien 3                          
Principal Amount or Par Value $ 1,322 [15],[16],[21],[32]   $ 1,322 [15],[16],[21],[32]   $ 1,328 [19],[20],[23],[28]                
Spread 4.50% [15],[16],[32]   4.50% [15],[16],[32]   4.75% [19],[20],[28] 4.50% [15],[16],[32] 4.50% [15],[16],[32] 4.75% [19],[20],[28] 4.75% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 1,328                    
Fair value, ending balance $ 1,295 [15],[16],[32]   1,295 [15],[16],[32]   $ 1,328 [19],[20],[28]                
Investment, Identifier [Axis]: Auctane Inc. (fka Stamps.com Inc.) | First lien                          
Principal Amount or Par Value $ 31,814 [15],[16],[21],[32]   $ 31,814 [15],[16],[21],[32]   $ 36,155 [19],[20],[23],[28]                
Spread 5.75% [15],[16],[32]   5.75% [15],[16],[32]   5.75% [19],[20],[28] 5.75% [15],[16],[32] 5.75% [15],[16],[32] 5.75% [19],[20],[28] 5.75% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 36,155                    
Fair value, ending balance $ 31,576 [15],[16],[32]   31,576 [15],[16],[32]   $ 36,155 [19],[20],[28]                
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP | First lien - Undrawn                          
Principal Amount or Par Value [15],[16],[21],[22] 3,707   3,707                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] (60)   (60)                    
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP | First lien - Undrawn 1                          
Principal Amount or Par Value [19],[20],[23],[24]         2,122                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance [19],[20],[24]         0                
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP | First lien - Undrawn 2                          
Principal Amount or Par Value [19],[20],[23],[24]         3,707                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance [19],[20],[24]         0                
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP | First lien 1                          
Principal Amount or Par Value $ 15,524 [15],[21],[29],[30]   $ 15,524 [15],[21],[29],[30]   $ 15,602 [19],[23],[26],[27]                
Spread 4.75% [15],[29],[30]   4.75% [15],[29],[30]   4.75% [19],[26],[27] 4.75% [15],[29],[30] 4.75% [15],[29],[30] 4.75% [19],[26],[27] 4.75% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 15,602                    
Fair value, ending balance $ 15,354 [15],[29],[30]   15,354 [15],[29],[30]   $ 15,602 [19],[26],[27]                
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP | First lien 2                          
Principal Amount or Par Value $ 5,753 [15],[21],[29],[30]   $ 5,753 [15],[21],[29],[30]   $ 5,782 [19],[23],[26],[27]                
Spread 4.25% [15],[29],[30]   4.25% [15],[29],[30]   4.25% [19],[26],[27] 4.25% [15],[29],[30] 4.25% [15],[29],[30] 4.25% [19],[26],[27] 4.25% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 5,782                    
Fair value, ending balance $ 5,661 [15],[29],[30]   5,661 [15],[29],[30]   $ 5,782 [19],[26],[27]                
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP | First lien 3                          
Principal Amount or Par Value $ 1,266 [15],[16],[21],[32]   $ 1,266 [15],[16],[21],[32]   $ 378 [19],[20],[23],[28]                
Spread 4.25% [15],[16],[32]   4.25% [15],[16],[32]   4.25% [19],[20],[28] 4.25% [15],[16],[32] 4.25% [15],[16],[32] 4.25% [19],[20],[28] 4.25% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 378                    
Fair value, ending balance $ 1,245 [15],[16],[32]   1,245 [15],[16],[32]   $ 378 [19],[20],[28]                
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP | First lien 4                          
Principal Amount or Par Value [15],[16],[21],[32] $ 1,228   $ 1,228                    
Spread [15],[16],[32] 4.25%   4.25%     4.25% 4.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[32] $ 1,209   $ 1,209                    
Investment, Identifier [Axis]: Bamboo Health Holdings, LLC (f/k/a Appriss Health, LLC) | First lien                          
Principal Amount or Par Value $ 3,046 [15],[16],[21],[32]   $ 3,046 [15],[16],[21],[32]   $ 3,046 [19],[20],[23],[28]                
Spread 4.75% [15],[16],[32]   4.75% [15],[16],[32]   4.75% [19],[20],[28] 4.75% [15],[16],[32] 4.75% [15],[16],[32] 4.75% [19],[20],[28] 4.75% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 3,046                    
Fair value, ending balance $ 3,046 [15],[16],[32]   3,046 [15],[16],[32]   $ 3,046 [19],[20],[28]                
Investment, Identifier [Axis]: Bamboo Health Holdings, LLC (f/k/a Appriss Health, LLC) | First lien - Undrawn                          
Principal Amount or Par Value 417 [15],[16],[21],[22]   417 [15],[16],[21],[22]   417 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [19],[20],[24]                
Investment, Identifier [Axis]: Bonterra LLC | First lien                          
Principal Amount or Par Value [19],[23],[26],[27]         $ 14,989                
Spread [19],[26],[27]         4.75%     4.75% 4.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     14,952                    
Fair value, ending balance [19],[26],[27]         $ 14,952                
Investment, Identifier [Axis]: Bonterra LLC | First lien - Drawn                          
Principal Amount or Par Value [15],[16],[21],[22] $ 326   $ 326                    
Spread [15],[16],[22] 4.75%   4.75%     4.75% 4.75%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] $ 318   $ 318                    
Investment, Identifier [Axis]: Bonterra LLC | First lien - Drawn 1                          
Principal Amount or Par Value [19],[20],[23],[24],[28]         $ 1,629                
Spread [19],[20],[24],[28]         4.75%     4.75% 4.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24],[28]     1,625                    
Fair value, ending balance [19],[20],[24],[28]         $ 1,625                
Investment, Identifier [Axis]: Bonterra LLC | First lien - Drawn 2                          
Principal Amount or Par Value [19],[20],[23],[24]         $ 244                
Spread [19],[20],[24]         4.75%     4.75% 4.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     244                    
Fair value, ending balance [19],[20],[24]         $ 244                
Investment, Identifier [Axis]: Bonterra LLC | First lien - Undrawn                          
Principal Amount or Par Value [15],[16],[21],[22] 1,303   1,303                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] (30)   (30)                    
Investment, Identifier [Axis]: Bonterra LLC | First lien - Undrawn 1                          
Principal Amount or Par Value [19],[20],[23],[24]         0                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance [19],[20],[24]         0                
Investment, Identifier [Axis]: Bonterra LLC | First lien - Undrawn 2                          
Principal Amount or Par Value [19],[20],[23],[24]         1,384                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     (3)                    
Fair value, ending balance [19],[20],[24]         (3)                
Investment, Identifier [Axis]: Bonterra LLC | First lien 1                          
Principal Amount or Par Value [15],[21],[29],[30] $ 14,914   $ 14,914                    
Spread [15],[29],[30] 4.75%   4.75%     4.75% 4.75%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[29],[30] $ 14,570   $ 14,570                    
Investment, Identifier [Axis]: Bonterra LLC | First lien 2                          
Principal Amount or Par Value [15],[16],[21],[32] $ 1,625   $ 1,625                    
Spread [15],[16],[32] 4.75%   4.75%     4.75% 4.75%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[32] $ 1,587   $ 1,587                    
Investment, Identifier [Axis]: Brave Parent Holdings, Inc. | First lien                          
Principal Amount or Par Value $ 21,016 [15],[21],[40]   $ 21,016 [15],[21],[40]   $ 21,124 [19],[23],[41]                
Spread 4.50% [15],[40]   4.50% [15],[40]   4.25% [19],[41] 4.50% [15],[40] 4.50% [15],[40] 4.25% [19],[41] 4.25% [19],[41]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[41]     $ 21,124                    
Fair value, ending balance $ 20,323 [15],[40]   20,323 [15],[40]   $ 21,124 [19],[41]                
Investment, Identifier [Axis]: Bullhorn, Inc. | First lien - Drawn                          
Principal Amount or Par Value $ 125 [15],[16],[21],[22]   $ 125 [15],[16],[21],[22]   $ 125 [19],[20],[23],[24]                
Spread 5.00% [15],[16],[22]   5.00% [15],[16],[22]   5.00% [19],[20],[24] 5.00% [15],[16],[22] 5.00% [15],[16],[22] 5.00% [19],[20],[24] 5.00% [19],[20],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     $ 125                    
Fair value, ending balance $ 124 [15],[16],[22]   124 [15],[16],[22]   $ 125 [19],[20],[24]                
Investment, Identifier [Axis]: Bullhorn, Inc. | First lien - Undrawn 1                          
Principal Amount or Par Value [19],[20],[23],[24]         822                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance [19],[20],[24]         0                
Investment, Identifier [Axis]: Bullhorn, Inc. | First lien - Undrawn 2                          
Principal Amount or Par Value [19],[20],[23],[24]         811                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance [19],[20],[24]         0                
Investment, Identifier [Axis]: Bullhorn, Inc. | First lien 1                          
Principal Amount or Par Value $ 8,879 [15],[21],[29],[30]   $ 8,879 [15],[21],[29],[30]   $ 13,206 [19],[23],[26],[27]                
Spread 5.00% [15],[29],[30]   5.00% [15],[29],[30]   5.00% [19],[26],[27] 5.00% [15],[29],[30] 5.00% [15],[29],[30] 5.00% [19],[26],[27] 5.00% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 13,206                    
Fair value, ending balance $ 8,813 [15],[29],[30]   8,813 [15],[29],[30]   $ 13,206 [19],[26],[27]                
Investment, Identifier [Axis]: Bullhorn, Inc. | First lien 2                          
Principal Amount or Par Value $ 3,398 [15],[21],[29],[30]   $ 3,398 [15],[21],[29],[30]   $ 8,879 [19],[23],[26],[27]                
Spread 5.00% [15],[29],[30]   5.00% [15],[29],[30]   5.00% [19],[26],[27] 5.00% [15],[29],[30] 5.00% [15],[29],[30] 5.00% [19],[26],[27] 5.00% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 8,879                    
Fair value, ending balance $ 3,373 [15],[29],[30]   3,373 [15],[29],[30]   $ 8,879 [19],[26],[27]                
Investment, Identifier [Axis]: Bullhorn, Inc. | First lien 3                          
Principal Amount or Par Value $ 1,025 [15],[16],[21],[32]   $ 1,025 [15],[16],[21],[32]   $ 3,398 [19],[23],[26],[27]                
Spread 5.00% [15],[16],[32]   5.00% [15],[16],[32]   5.00% [19],[26],[27] 5.00% [15],[16],[32] 5.00% [15],[16],[32] 5.00% [19],[26],[27] 5.00% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 3,398                    
Fair value, ending balance $ 1,017 [15],[16],[32]   1,017 [15],[16],[32]   $ 3,398 [19],[26],[27]                
Investment, Identifier [Axis]: Bullhorn, Inc. | First lien 4                          
Principal Amount or Par Value $ 761 [15],[21],[29],[30]   $ 761 [15],[21],[29],[30]   $ 1,025 [19],[20],[23],[28]                
Spread 5.00% [15],[29],[30]   5.00% [15],[29],[30]   5.00% [19],[20],[28] 5.00% [15],[29],[30] 5.00% [15],[29],[30] 5.00% [19],[20],[28] 5.00% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 1,025                    
Fair value, ending balance $ 755 [15],[29],[30]   755 [15],[29],[30]   $ 1,025 [19],[20],[28]                
Investment, Identifier [Axis]: Bullhorn, Inc. | First lien 5                          
Principal Amount or Par Value $ 341 [15],[21],[29],[30]   $ 341 [15],[21],[29],[30]   $ 761 [19],[23],[26],[27]                
Spread 5.00% [15],[29],[30]   5.00% [15],[29],[30]   5.00% [19],[26],[27] 5.00% [15],[29],[30] 5.00% [15],[29],[30] 5.00% [19],[26],[27] 5.00% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 761                    
Fair value, ending balance $ 338 [15],[29],[30]   338 [15],[29],[30]   $ 761 [19],[26],[27]                
Investment, Identifier [Axis]: Bullhorn, Inc. | First lien 6                          
Principal Amount or Par Value $ 272 [15],[21],[29],[30]   $ 272 [15],[21],[29],[30]   $ 341 [19],[23],[26],[27]                
Spread 5.00% [15],[29],[30]   5.00% [15],[29],[30]   5.00% [19],[26],[27] 5.00% [15],[29],[30] 5.00% [15],[29],[30] 5.00% [19],[26],[27] 5.00% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 341                    
Fair value, ending balance $ 270 [15],[29],[30]   270 [15],[29],[30]   $ 341 [19],[26],[27]                
Investment, Identifier [Axis]: Bullhorn, Inc. | First lien 7                          
Principal Amount or Par Value [19],[23],[26],[27]         $ 272                
Spread [19],[26],[27]         5.00%     5.00% 5.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     272                    
Fair value, ending balance [19],[26],[27]         $ 272                
Investment, Identifier [Axis]: Bullhorn, Inc.. | First lien - Undrawn                          
Principal Amount or Par Value [15],[16],[21],[22] 811   811                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] (6)   (6)                    
Investment, Identifier [Axis]: CFS Management, LLC | First lien 1                          
Principal Amount or Par Value $ 12,383 [15],[16],[21],[32]   $ 12,383 [15],[16],[21],[32]   $ 12,124 [19],[20],[23],[28]                
Spread 6.25% [15],[16],[32],[35]   6.25% [15],[16],[32],[35]   3.41% [19],[20],[28],[34] 6.25% [15],[16],[32],[35] 6.25% [15],[16],[32],[35] 3.41% [19],[20],[28],[34] 3.41% [19],[20],[28],[34]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 10,608                    
Fair value, ending balance $ 10,835 [15],[16],[32]   10,835 [15],[16],[32]   $ 10,608 [19],[20],[28]                
Investment, Identifier [Axis]: CFS Management, LLC | First lien 2                          
Principal Amount or Par Value $ 3,690 [15],[21],[29],[30]   $ 3,690 [15],[21],[29],[30]   $ 3,612 [19],[23],[26],[27]                
Spread 6.25% [15],[29],[30],[35]   6.25% [15],[29],[30],[35]   3.41% [19],[26],[27],[34] 6.25% [15],[29],[30],[35] 6.25% [15],[29],[30],[35] 3.41% [19],[26],[27],[34] 3.41% [19],[26],[27],[34]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 3,161                    
Fair value, ending balance $ 3,228 [15],[29],[30]   3,228 [15],[29],[30]   $ 3,161 [19],[26],[27]                
Investment, Identifier [Axis]: CG Group Holdings, LLC | First lien                          
Principal Amount or Par Value [19],[23],[26],[27]         $ 8,582                
Spread [19],[26],[27],[34]         6.75%     6.75% 6.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     8,582                    
Fair value, ending balance [19],[26],[27]         $ 8,582                
Investment, Identifier [Axis]: CG Group Holdings, LLC | First lien - Drawn                          
Principal Amount or Par Value [19],[20],[23],[24],[28]         $ 1,089                
Spread [19],[20],[24],[28],[34]         6.75%     6.75% 6.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24],[28]     1,089                    
Fair value, ending balance [19],[20],[24],[28]         $ 1,089                
Investment, Identifier [Axis]: CG Group Holdings, LLC | First lien - Undrawn                          
Principal Amount or Par Value [19],[20],[23],[24]         113                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance [19],[20],[24]         0                
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc. | First lien                          
Principal Amount or Par Value [19],[23],[26],[27]         $ 6,451                
Spread [19],[26],[27]         4.75%     4.75% 4.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     6,451                    
Fair value, ending balance [19],[26],[27]         $ 6,451                
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc. | First lien - Undrawn 1                          
Principal Amount or Par Value [19],[20],[23],[24]         1,629                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance [19],[20],[24]         0                
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc. | First lien - Undrawn 2                          
Principal Amount or Par Value [19],[20],[23],[24]         1,086                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance [19],[20],[24]         0                
Investment, Identifier [Axis]: Capstone Borrower, Inc. | First lien                          
Principal Amount or Par Value [16],[21],[32] $ 3,763   $ 3,763                    
Spread [16],[32] 8.00%   8.00%     8.00% 8.00%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [16],[32] $ 3,580   $ 3,580                    
Investment, Identifier [Axis]: Cardinal Parent, Inc. | First lien                          
Principal Amount or Par Value $ 11,548 [21],[25]   $ 11,548 [21],[25]   $ 11,609 [23],[31]                
Spread 4.50% [25]   4.50% [25]   4.50% [31] 4.50% [25] 4.50% [25] 4.50% [31] 4.50% [31]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [31]     $ 11,366                    
Fair value, ending balance $ 10,229 [25]   10,229 [25]   $ 11,366 [31]                
Investment, Identifier [Axis]: Cardinal Parent, Inc. | Second lien                          
Principal Amount or Par Value $ 9,767 [15],[21],[25]   $ 9,767 [15],[21],[25]   $ 9,767 [19],[23],[31]                
Spread 7.75% [15],[25]   7.75% [15],[25]   7.75% [19],[31] 7.75% [15],[25] 7.75% [15],[25] 7.75% [19],[31] 7.75% [19],[31]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[31]     $ 9,653                    
Fair value, ending balance $ 8,475 [15],[25]   8,475 [15],[25]   $ 9,653 [19],[31]                
Investment, Identifier [Axis]: Centegix Intermediate II, LLC | First lien                          
Principal Amount or Par Value [15],[21],[29],[30] $ 240   $ 240                    
Spread [15],[29],[30],[35] 2.75%   2.75%     2.75% 2.75%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[29],[30] $ 239   $ 239                    
Investment, Identifier [Axis]: Centegix Intermediate II, LLC. | First lien - Undrawn                          
Principal Amount or Par Value [15],[16],[21],[22] 1,177   1,177                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] (6)   (6)                    
Investment, Identifier [Axis]: CentralSquare Technologies, LLC | First lien                          
Principal Amount or Par Value $ 36,322 [15],[21],[29],[30]   $ 36,322 [15],[21],[29],[30]   $ 36,497 [19],[23],[26],[27]                
Spread 5.75% [15],[29],[30]   5.75% [15],[29],[30]   5.75% [19],[26],[27] 5.75% [15],[29],[30] 5.75% [15],[29],[30] 5.75% [19],[26],[27] 5.75% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 36,497                    
Fair value, ending balance $ 36,322 [15],[29],[30]   36,322 [15],[29],[30]   $ 36,497 [19],[26],[27]                
Investment, Identifier [Axis]: CentralSquare Technologies, LLC | First lien - Undrawn                          
Principal Amount or Par Value 3,980 [15],[16],[21],[22]   3,980 [15],[16],[21],[22]   3,980 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [19],[20],[24]                
Investment, Identifier [Axis]: Ciklum Inc. | First lien - Undrawn                          
Principal Amount or Par Value 2,989 [15],[16],[21],[22],[38]   2,989 [15],[16],[21],[22],[38]   2,989 [19],[20],[23],[24],[39]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24],[39]     0                    
Fair value, ending balance 0 [15],[16],[22],[38]   0 [15],[16],[22],[38]   0 [19],[20],[24],[39]                
Investment, Identifier [Axis]: Ciklum Inc. | First lien 1                          
Principal Amount or Par Value $ 9,392 [15],[21],[29],[30]   $ 9,392 [15],[21],[29],[30]   $ 9,440 [19],[23],[26],[27]                
Spread 7.00% [15],[29],[30]   7.00% [15],[29],[30]   6.50% [19],[26],[27] 7.00% [15],[29],[30] 7.00% [15],[29],[30] 6.50% [19],[26],[27] 6.50% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 9,440                    
Fair value, ending balance $ 9,392 [15],[29],[30]   9,392 [15],[29],[30]   $ 9,440 [19],[26],[27]                
Investment, Identifier [Axis]: Ciklum Inc. | First lien 2                          
Principal Amount or Par Value $ 5,312 [15],[16],[21],[32]   $ 5,312 [15],[16],[21],[32]   $ 5,339 [19],[20],[23],[28]                
Spread 7.00% [15],[16],[32]   7.00% [15],[16],[32]   6.50% [19],[20],[28] 7.00% [15],[16],[32] 7.00% [15],[16],[32] 6.50% [19],[20],[28] 6.50% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 5,339                    
Fair value, ending balance $ 5,312 [15],[16],[32]   5,312 [15],[16],[32]   $ 5,339 [19],[20],[28]                
Investment, Identifier [Axis]: Community Management Holdings MidCo 2, LLC | First lien                          
Principal Amount or Par Value $ 1,285 [15],[16],[21],[32]   $ 1,285 [15],[16],[21],[32]   $ 1,291 [19],[20],[23],[28]                
Spread 5.00% [15],[16],[32]   5.00% [15],[16],[32]   4.75% [19],[20],[28] 5.00% [15],[16],[32] 5.00% [15],[16],[32] 4.75% [19],[20],[28] 4.75% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 1,291                    
Fair value, ending balance $ 1,285 [15],[16],[32]   1,285 [15],[16],[32]   $ 1,291 [19],[20],[28]                
Investment, Identifier [Axis]: Community Management Holdings MidCo 2, LLC | First lien - Drawn                          
Principal Amount or Par Value $ 568 [15],[16],[21],[22],[32]   $ 568 [15],[16],[21],[22],[32]   $ 9 [19],[20],[23],[24],[28]                
Spread 5.00% [15],[16],[22],[32]   5.00% [15],[16],[22],[32]   4.75% [19],[20],[24],[28] 5.00% [15],[16],[22],[32] 5.00% [15],[16],[22],[32] 4.75% [19],[20],[24],[28] 4.75% [19],[20],[24],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24],[28]     $ 9                    
Fair value, ending balance $ 568 [15],[16],[22],[32]   568 [15],[16],[22],[32]   $ 9 [19],[20],[24],[28]                
Investment, Identifier [Axis]: Community Management Holdings MidCo 2, LLC | First lien - Undrawn                          
Principal Amount or Par Value 41 [15],[16],[21],[22]   41 [15],[16],[21],[22]   602 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [19],[20],[24]                
Investment, Identifier [Axis]: Compsych Investments Corp | First lien - Undrawn                          
Principal Amount or Par Value [19],[20],[23],[24]         2,253                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance [19],[20],[24]         0                
Investment, Identifier [Axis]: Compsych Investments Corp. | First lien                          
Principal Amount or Par Value $ 7,750 [15],[21],[29],[30]   $ 7,750 [15],[21],[29],[30]   $ 7,790 [19],[23],[26],[27]                
Spread 4.75% [15],[29],[30]   4.75% [15],[29],[30]   4.75% [19],[26],[27] 4.75% [15],[29],[30] 4.75% [15],[29],[30] 4.75% [19],[26],[27] 4.75% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 7,790                    
Fair value, ending balance $ 7,750 [15],[29],[30]   7,750 [15],[29],[30]   $ 7,790 [19],[26],[27]                
Investment, Identifier [Axis]: Compsych Investments Corp. | First lien - Undrawn                          
Principal Amount or Par Value [15],[16],[21],[22] 2,253   2,253                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: Consumer Products | First lien                          
Principal Amount or Par Value [15],[16],[21] 4,976   4,976                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16] 4,976   4,976                    
Investment, Identifier [Axis]: Consumer Products | Subordinated                          
Principal Amount or Par Value [15],[16],[21] 2,410   2,410                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16] 2,410   2,410                    
Investment, Identifier [Axis]: Convey Health Solutions, Inc. | First lien 1                          
Principal Amount or Par Value $ 13,060 [15],[21],[30]   $ 13,060 [15],[21],[30]   $ 13,518 [19],[23],[26],[27]                
Spread 1.31% [15],[30],[35],[36]   1.31% [15],[30],[35],[36]   1.00% [19],[26],[27],[34] 1.31% [15],[30],[35],[36] 1.31% [15],[30],[35],[36] 1.00% [19],[26],[27],[34] 1.00% [19],[26],[27],[34]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 9,869                    
Fair value, ending balance $ 1,635 [15],[30]   1,635 [15],[30]   $ 9,869 [19],[26],[27]                
Investment, Identifier [Axis]: Convey Health Solutions, Inc. | First lien 2                          
Principal Amount or Par Value $ 2,181 [15],[21],[30]   $ 2,181 [15],[21],[30]   $ 2,257 [19],[23],[26],[27]                
Spread 1.31% [15],[30],[35],[36]   1.31% [15],[30],[35],[36]   1.00% [19],[26],[27],[34] 1.31% [15],[30],[35],[36] 1.31% [15],[30],[35],[36] 1.00% [19],[26],[27],[34] 1.00% [19],[26],[27],[34]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 1,648                    
Fair value, ending balance $ 273 [15],[30]   273 [15],[30]   $ 1,648 [19],[26],[27]                
Investment, Identifier [Axis]: CoreTrust Purchasing Group LLC | First lien                          
Principal Amount or Par Value $ 1,462 [15],[16],[21],[32]   $ 1,462 [15],[16],[21],[32]   $ 1,470 [19],[20],[23],[28]                
Spread 5.25% [15],[16],[32]   5.25% [15],[16],[32]   5.00% [19],[20],[28] 5.25% [15],[16],[32] 5.25% [15],[16],[32] 5.00% [19],[20],[28] 5.00% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 1,470                    
Fair value, ending balance $ 1,462 [15],[16],[32]   1,462 [15],[16],[32]   $ 1,470 [19],[20],[28]                
Investment, Identifier [Axis]: CoreTrust Purchasing Group LLC | First lien - Undrawn                          
Principal Amount or Par Value [19],[20],[23],[24]         147                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance [19],[20],[24]         0                
Investment, Identifier [Axis]: Coupa Holdings, LLC | First lien                          
Principal Amount or Par Value [19],[23],[26],[27]         $ 14,243                
Spread [19],[26],[27]         5.25%     5.25% 5.25%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     14,243                    
Fair value, ending balance [19],[26],[27]         $ 14,243                
Investment, Identifier [Axis]: Coupa Holdings, LLC | First lien - Drawn                          
Principal Amount or Par Value [15],[16],[21],[22],[32] $ 659   $ 659                    
Spread [15],[16],[22],[32] 5.25%   5.25%     5.25% 5.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22],[32] $ 650   $ 650                    
Investment, Identifier [Axis]: Coupa Holdings, LLC | First lien - Undrawn                          
Principal Amount or Par Value [15],[16],[21],[22] 330   330                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] (4)   (4)                    
Investment, Identifier [Axis]: Coupa Holdings, LLC | First lien - Undrawn 1                          
Principal Amount or Par Value [19],[20],[23],[24]         1,291                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance [19],[20],[24]         0                
Investment, Identifier [Axis]: Coupa Holdings, LLC | First lien - Undrawn 2                          
Principal Amount or Par Value [19],[20],[23],[24]         989                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance [19],[20],[24]         0                
Investment, Identifier [Axis]: Coupa Holdings, LLC | First lien 1                          
Principal Amount or Par Value [15],[21],[29],[30] $ 14,171   $ 14,171                    
Spread [15],[29],[30] 5.25%   5.25%     5.25% 5.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[29],[30] $ 13,981   $ 13,981                    
Investment, Identifier [Axis]: Coupa Holdings, LLC | First lien 2                          
Principal Amount or Par Value [15],[16],[21],[32] $ 1,291   $ 1,291                    
Spread [15],[16],[32] 5.25%   5.25%     5.25% 5.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[32] $ 1,274   $ 1,274                    
Investment, Identifier [Axis]: Cronos Crimson Holdings, Inc. (f/k/a NMC Crimson Holdings, Inc.) | First lien 1                          
Principal Amount or Par Value $ 24,172 [15],[21],[29],[30]   $ 24,172 [15],[21],[29],[30]   $ 24,172 [19],[23],[26],[27]                
Spread 6.09% [15],[29],[30]   6.09% [15],[29],[30]   6.09% [19],[26],[27] 6.09% [15],[29],[30] 6.09% [15],[29],[30] 6.09% [19],[26],[27] 6.09% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 24,172                    
Fair value, ending balance $ 23,795 [15],[29],[30]   23,795 [15],[29],[30]   $ 24,172 [19],[26],[27]                
Investment, Identifier [Axis]: Cronos Crimson Holdings, Inc. (f/k/a NMC Crimson Holdings, Inc.) | First lien 2                          
Principal Amount or Par Value $ 5,012 [15],[16],[21],[32]   $ 5,012 [15],[16],[21],[32]   $ 5,012 [19],[20],[23],[28]                
Spread 6.09% [15],[16],[32]   6.09% [15],[16],[32]   6.09% [19],[20],[28] 6.09% [15],[16],[32] 6.09% [15],[16],[32] 6.09% [19],[20],[28] 6.09% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 5,012                    
Fair value, ending balance $ 4,934 [15],[16],[32]   4,934 [15],[16],[32]   $ 5,012 [19],[20],[28]                
Investment, Identifier [Axis]: Cronos Crimson Holdings, Inc. (f/k/a NMC Crimson Holdings, Inc.) | First lien 3                          
Principal Amount or Par Value $ 4,706 [15],[21],[29],[30]   $ 4,706 [15],[21],[29],[30]   $ 4,706 [19],[23],[26],[27]                
Spread 6.24% [15],[29],[30]   6.24% [15],[29],[30]   6.24% [19],[26],[27] 6.24% [15],[29],[30] 6.24% [15],[29],[30] 6.24% [19],[26],[27] 6.24% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 4,706                    
Fair value, ending balance $ 4,632 [15],[29],[30]   4,632 [15],[29],[30]   $ 4,706 [19],[26],[27]                
Investment, Identifier [Axis]: DCA Investment Holding, LLC | First lien 1                          
Principal Amount or Par Value [19],[23],[26],[27]         $ 1,786                
Spread [19],[26],[27]         8.41%     8.41% 8.41%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     1,574                    
Fair value, ending balance [19],[26],[27]         $ 1,574                
Investment, Identifier [Axis]: DCA Investment Holding, LLC | First lien 2                          
Principal Amount or Par Value [19],[20],[23],[28]         $ 1,000                
Spread [19],[20],[28]         8.50%     8.50% 8.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     882                    
Fair value, ending balance [19],[20],[28]         $ 882                
Investment, Identifier [Axis]: DCA TopCo LP | Class A Common Units 1                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[30] 617   617                    
Investment, Identifier [Axis]: DCA TopCo LP | Class A Common Units 2                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[32] $ 345   $ 345                    
Investment, Identifier [Axis]: DCA TopCo LP | First lien                          
Number of investments held | investment 2   2     2 2            
Investment, Identifier [Axis]: DCA TopCo LP | First lien 1                          
Principal Amount or Par Value [15],[21],[29],[30] $ 957   $ 957                    
Spread [15],[29],[30],[35] 4.25%   4.25%     4.25% 4.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[29],[30] $ 957   $ 957                    
Investment, Identifier [Axis]: DCA TopCo LP | First lien 2                          
Principal Amount or Par Value [15],[16],[21],[32] $ 536   $ 536                    
Spread [15],[16],[32],[35] 4.25%   4.25%     4.25% 4.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[32] $ 536   $ 536                    
Investment, Identifier [Axis]: DG Investment Intermediate Holdings 2, Inc. | Second lien                          
Principal Amount or Par Value $ 3,024 [15],[16],[21],[32]   $ 3,024 [15],[16],[21],[32]   $ 9,512 [19],[20],[23],[28]                
Spread 5.50% [15],[16],[32]   5.50% [15],[16],[32]   5.50% [19],[20],[28] 5.50% [15],[16],[32] 5.50% [15],[16],[32] 5.50% [19],[20],[28] 5.50% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 9,464                    
Fair value, ending balance $ 3,024 [15],[16],[32]   3,024 [15],[16],[32]   $ 9,464 [19],[20],[28]                
Investment, Identifier [Axis]: DOCS, MSO, LLC | First lien - Undrawn                          
Principal Amount or Par Value 2,405 [15],[16],[21],[22]   2,405 [15],[16],[21],[22]   2,405 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [19],[20],[24]                
Investment, Identifier [Axis]: DOCS, MSO, LLC | First lien 1                          
Principal Amount or Par Value $ 3,223 [15],[21],[25]   $ 3,223 [15],[21],[25]   $ 18,149 [19],[20],[23],[28]                
Spread 5.00% [15],[25]   5.00% [15],[25]   5.75% [19],[20],[28] 5.00% [15],[25] 5.00% [15],[25] 5.75% [19],[20],[28] 5.75% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 18,149                    
Fair value, ending balance $ 3,223 [15],[25]   3,223 [15],[25]   $ 18,149 [19],[20],[28]                
Investment, Identifier [Axis]: DOCS, MSO, LLC | First lien 2                          
Principal Amount or Par Value $ 1,591 [15],[16],[21],[32]   $ 1,591 [15],[16],[21],[32]   $ 6,797 [19],[23],[31]                
Spread 5.00% [15],[16],[32]   5.00% [15],[16],[32]   5.75% [19],[31] 5.00% [15],[16],[32] 5.00% [15],[16],[32] 5.75% [19],[31] 5.75% [19],[31]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[31]     $ 6,797                    
Fair value, ending balance $ 1,591 [15],[16],[32]   1,591 [15],[16],[32]   $ 6,797 [19],[31]                
Investment, Identifier [Axis]: DOCS, MSO, LLC | First lien 3                          
Principal Amount or Par Value [19],[20],[23],[28]         $ 3,354                
Spread [19],[20],[28]         5.75%     5.75% 5.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     3,354                    
Fair value, ending balance [19],[20],[28]         $ 3,354                
Investment, Identifier [Axis]: DT1 Midco Corp | First lien                          
Principal Amount or Par Value $ 1,335 [15],[21],[29],[30]   $ 1,335 [15],[21],[29],[30]   $ 1,342 [19],[23],[26],[27]                
Spread 5.25% [15],[29],[30]   5.25% [15],[29],[30]   5.00% [19],[26],[27] 5.25% [15],[29],[30] 5.25% [15],[29],[30] 5.00% [19],[26],[27] 5.00% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 1,335                    
Fair value, ending balance $ 1,335 [15],[29],[30]   1,335 [15],[29],[30]   $ 1,335 [19],[26],[27]                
Investment, Identifier [Axis]: DT1 Midco Corp | First lien - Drawn                          
Principal Amount or Par Value $ 32 [15],[16],[21],[22]   $ 32 [15],[16],[21],[22]   $ 32 [19],[20],[23],[24]                
Spread 5.25% [15],[16],[22]   5.25% [15],[16],[22]   5.00% [19],[20],[24] 5.25% [15],[16],[22] 5.25% [15],[16],[22] 5.00% [19],[20],[24] 5.00% [19],[20],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     $ 32                    
Fair value, ending balance $ 32 [15],[16],[22]   32 [15],[16],[22]   $ 32 [19],[20],[24]                
Investment, Identifier [Axis]: DT1 Midco Corp | First lien - Undrawn 1                          
Principal Amount or Par Value 4,462 [15],[16],[21],[22]   4,462 [15],[16],[21],[22]   674 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     (3)                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   (3) [19],[20],[24]                
Investment, Identifier [Axis]: DT1 Midco Corp | First lien - Undrawn 2                          
Principal Amount or Par Value 674 [15],[16],[21],[22]   674 [15],[16],[21],[22]   4,462 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     (22)                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   (22) [19],[20],[24]                
Investment, Identifier [Axis]: Daxko Acquisition Corporation | First lien - Undrawn                          
Principal Amount or Par Value [19],[20],[23],[24]         986                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance [19],[20],[24]         0                
Investment, Identifier [Axis]: Daxko Acquisition Corporation | First lien 1                          
Principal Amount or Par Value $ 12,679 [15],[16],[21],[32]   $ 12,679 [15],[16],[21],[32]   $ 12,746 [19],[20],[23],[28]                
Spread 4.75% [15],[16],[32]   4.75% [15],[16],[32]   4.75% [19],[20],[28] 4.75% [15],[16],[32] 4.75% [15],[16],[32] 4.75% [19],[20],[28] 4.75% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 12,746                    
Fair value, ending balance $ 12,533 [15],[16],[32]   12,533 [15],[16],[32]   $ 12,746 [19],[20],[28]                
Investment, Identifier [Axis]: Daxko Acquisition Corporation | First lien 2                          
Principal Amount or Par Value $ 1,068 [15],[21],[29],[30]   $ 1,068 [15],[21],[29],[30]   $ 1,074 [19],[23],[26],[27]                
Spread 4.75% [15],[29],[30]   4.75% [15],[29],[30]   4.75% [19],[26],[27] 4.75% [15],[29],[30] 4.75% [15],[29],[30] 4.75% [19],[26],[27] 4.75% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 1,074                    
Fair value, ending balance $ 1,056 [15],[29],[30]   1,056 [15],[29],[30]   $ 1,074 [19],[26],[27]                
Investment, Identifier [Axis]: Daxko Acquisition Corporation | First lien 3                          
Principal Amount or Par Value $ 64 [15],[16],[21]   $ 64 [15],[16],[21]   $ 64 [19],[20],[23]                
Spread 4.75% [15],[16]   4.75% [15],[16]   4.75% [19],[20] 4.75% [15],[16] 4.75% [15],[16] 4.75% [19],[20] 4.75% [19],[20]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20]     $ 64                    
Fair value, ending balance $ 63 [15],[16]   63 [15],[16]   $ 64 [19],[20]                
Investment, Identifier [Axis]: Daxko Acquisition Corporation. | First lien - Undrawn                          
Principal Amount or Par Value [15],[16],[21],[22] 986   986                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] (11)   (11)                    
Investment, Identifier [Axis]: Dealer Tire Holdings, LLC | Preferred Shares                          
Principal Amount or Par Value 27,116   27,116   90,671                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[32],[42] 25,191   25,191                    
Investment, Identifier [Axis]: Dealer Tire Holdings, LLC | Preferred shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28],[43]     87,225                    
Fair value, ending balance [19],[20],[28],[43]         87,225                
Investment, Identifier [Axis]: Deca Dental Holdings LLC | First lien 1                          
Principal Amount or Par Value $ 36,614 [15],[21],[29],[30]   $ 36,614 [15],[21],[29],[30]   $ 36,710 [19],[23],[26],[27]                
Spread 5.75% [15],[29],[30]   5.75% [15],[29],[30]   5.75% [19],[26],[27] 5.75% [15],[29],[30] 5.75% [15],[29],[30] 5.75% [19],[26],[27] 5.75% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 35,715                    
Fair value, ending balance $ 32,536 [15],[29],[30]   32,536 [15],[29],[30]   $ 35,715 [19],[26],[27]                
Investment, Identifier [Axis]: Deca Dental Holdings LLC | First lien 2                          
Principal Amount or Par Value $ 3,854 [15],[16],[21],[32]   $ 3,854 [15],[16],[21],[32]   $ 3,864 [19],[20],[23],[28]                
Spread 5.75% [15],[16],[32]   5.75% [15],[16],[32]   5.75% [19],[20],[28] 5.75% [15],[16],[32] 5.75% [15],[16],[32] 5.75% [19],[20],[28] 5.75% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 3,760                    
Fair value, ending balance $ 3,425 [15],[16],[32]   3,425 [15],[16],[32]   $ 3,760 [19],[20],[28]                
Investment, Identifier [Axis]: Deca Dental Holdings LLC | First lien 3                          
Principal Amount or Par Value $ 3,027 [15],[16],[21],[32]   $ 3,027 [15],[16],[21],[32]   $ 3,027 [19],[20],[23],[28]                
Spread 5.75% [15],[16],[32]   5.75% [15],[16],[32]   5.75% [19],[20],[28] 5.75% [15],[16],[32] 5.75% [15],[16],[32] 5.75% [19],[20],[28] 5.75% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 2,945                    
Fair value, ending balance $ 2,690 [15],[16],[32]   2,690 [15],[16],[32]   $ 2,945 [19],[20],[28]                
Investment, Identifier [Axis]: Denali Intermediate Holdings, Inc. | First lien                          
Principal Amount or Par Value [19],[23],[26],[27]         $ 9,091                
Spread [19],[26],[27]         5.50%     5.50% 5.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     9,045                    
Fair value, ending balance [19],[26],[27]         $ 9,045                
Investment, Identifier [Axis]: Denali Intermediate Holdings, Inc. | First lien - Undrawn                          
Principal Amount or Par Value [19],[20],[23],[24]         909                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     (5)                    
Fair value, ending balance [19],[20],[24]         $ (5)                
Investment, Identifier [Axis]: Diamond Parent Holdings Corp | Wholly-owned subsidiaries                          
Number of investments held | investment         2     2 2        
Investment, Identifier [Axis]: Digicert, Inc. | First lien                          
Principal Amount or Par Value $ 15,384 [15],[21],[29],[30]   $ 15,384 [15],[21],[29],[30]   $ 15,462 [19],[23],[26],[27]                
Spread 5.75% [15],[29],[30]   5.75% [15],[29],[30]   5.75% [19],[26],[27] 5.75% [15],[29],[30] 5.75% [15],[29],[30] 5.75% [19],[26],[27] 5.75% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 15,346                    
Fair value, ending balance $ 15,269 [15],[29],[30]   15,269 [15],[29],[30]   $ 15,346 [19],[26],[27]                
Investment, Identifier [Axis]: Digicert, Inc. | First lien - Undrawn                          
Principal Amount or Par Value 1,119 [15],[16],[21],[22]   1,119 [15],[16],[21],[22]   1,119 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     (8)                    
Fair value, ending balance (8) [15],[16],[22]   (8) [15],[16],[22]   $ (8) [19],[20],[24]                
Investment, Identifier [Axis]: Diligent Corporation | First lien                          
Principal Amount or Par Value [15],[16],[21],[32] 3,398   3,398                    
Number of investments held | investment         2     2 2        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[32] 3,310   3,310                    
Investment, Identifier [Axis]: Diligent Corporation | First lien - Drawn                          
Principal Amount or Par Value $ 895 [15],[16],[21],[22]   $ 895 [15],[16],[21],[22]   $ 532 [19],[20],[23],[24]                
Spread 5.00% [15],[16],[22]   5.00% [15],[16],[22]   5.00% [19],[20],[24] 5.00% [15],[16],[22] 5.00% [15],[16],[22] 5.00% [19],[20],[24] 5.00% [19],[20],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     $ 532                    
Fair value, ending balance $ 872 [15],[16],[22]   872 [15],[16],[22]   $ 532 [19],[20],[24]                
Investment, Identifier [Axis]: Diligent Corporation | First lien - Undrawn                          
Principal Amount or Par Value [15],[16],[21],[22] 1,371   1,371                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] (35)   (35)                    
Investment, Identifier [Axis]: Diligent Corporation | First lien - Undrawn 1                          
Principal Amount or Par Value [19],[20],[23],[24]         1,733                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance [19],[20],[24]         0                
Investment, Identifier [Axis]: Diligent Corporation | First lien - Undrawn 2                          
Principal Amount or Par Value [19],[20],[23],[24]         3,398                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance [19],[20],[24]         0                
Investment, Identifier [Axis]: Diligent Corporation | First lien 1                          
Principal Amount or Par Value [19],[23],[26],[27]         $ 19,821                
Spread [19],[26],[27]         5.00%     5.00% 5.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     19,821                    
Fair value, ending balance [19],[26],[27]         $ 19,821                
Investment, Identifier [Axis]: Diligent Corporation | First lien 2                          
Principal Amount or Par Value [19],[20],[23],[28]         $ 3,398                
Spread [19],[20],[28]         5.00%     5.00% 5.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     3,398                    
Fair value, ending balance [19],[20],[28]         $ 3,398                
Investment, Identifier [Axis]: Diligent Preferred Issuer, Inc. | Preferred shares                          
Principal Amount or Par Value         15,827                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[44]     15,036                    
Fair value, ending balance [19],[20],[44]         15,036                
Investment, Identifier [Axis]: Eagle Infrastructure Services, LLC (fka FR Arsenal Holdings II Corp.) / Eagle Infrastructure Super HoldCo, LLC                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance     18,337 19,156 19,156                
Gross additions     0 [4]   0 [5]                
Gross redemptions     0 [6]   0 [7]                
Net Change In Unrealized Appreciation (Depreciation)     6,141   (819)                
Fair value, ending balance $ 24,478   24,478   18,337                
Net Realized Gains (Losses)     0   0                
Interest Income     625   1,321                
Dividend Income     735   0                
Other Income     $ 0   0                
Investment, Identifier [Axis]: Eagle Infrastructure Services, LLC (fka FR Arsenal Holdings II Corp.) | First lien                          
Number of investments held | investment 2   2     2 2            
Investment, Identifier [Axis]: Eagle Infrastructure Services, LLC (fka FR Arsenal Holdings II Corp.) | First lien 1                          
Principal Amount or Par Value $ 10,628 [8],[15],[21],[29],[30]   $ 10,628 [8],[15],[21],[29],[30]   $ 10,628 [3],[19],[23],[26],[27]                
Spread 7.50% [8],[15],[29],[30]   7.50% [8],[15],[29],[30]   7.50% [3],[19],[26],[27] 7.50% [8],[15],[29],[30] 7.50% [8],[15],[29],[30] 7.50% [3],[19],[26],[27] 7.50% [3],[19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [3],[19],[26],[27]     $ 10,628                    
Fair value, ending balance $ 10,628 [8],[15],[29],[30]   10,628 [8],[15],[29],[30]   $ 10,628 [3],[19],[26],[27]                
Investment, Identifier [Axis]: Eagle Infrastructure Services, LLC (fka FR Arsenal Holdings II Corp.) | First lien 2                          
Principal Amount or Par Value $ 340 [8],[15],[16],[21]   $ 340 [8],[15],[16],[21]   $ 340 [3],[19],[20],[23]                
Spread 7.50% [8],[15],[16]   7.50% [8],[15],[16]   7.50% [3],[19],[20] 7.50% [8],[15],[16] 7.50% [8],[15],[16] 7.50% [3],[19],[20] 7.50% [3],[19],[20]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [3],[19],[20]     $ 340                    
Fair value, ending balance $ 340 [8],[15],[16]   340 [8],[15],[16]   $ 340 [3],[19],[20]                
Investment, Identifier [Axis]: Eagle Infrastructure Super HoldCo, LLC | Ordinary Shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [8],[15],[16] 13,510   13,510                    
Investment, Identifier [Axis]: Eagle Infrastructure Super HoldCo, LLC | Ordinary shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [3],[19],[20]     7,369                    
Fair value, ending balance [3],[19],[20]         7,369                
Investment, Identifier [Axis]: Eclipse Buyer Inc. | First lien                          
Principal Amount or Par Value $ 7,113 [15],[21],[25],[45]   $ 7,113 [15],[21],[25],[45]   $ 7,113 [19],[23],[31],[46]                
Spread 4.50% [15],[25],[45]   4.50% [15],[25],[45]   4.50% [19],[31],[46] 4.50% [15],[25],[45] 4.50% [15],[25],[45] 4.50% [19],[31],[46] 4.50% [19],[31],[46]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[31],[46]     $ 7,113                    
Fair value, ending balance $ 7,007 [15],[25],[45]   7,007 [15],[25],[45]   $ 7,113 [19],[31],[46]                
Investment, Identifier [Axis]: Eclipse Buyer Inc. | First lien - Undrawn 1                          
Principal Amount or Par Value [19],[23],[24],[31]         1,206                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[24],[31]     0                    
Fair value, ending balance [19],[24],[31]         0                
Investment, Identifier [Axis]: Eclipse Buyer Inc. | First lien - Undrawn 2                          
Principal Amount or Par Value 4,190 [15],[16],[21],[22]   4,190 [15],[16],[21],[22]   4,190 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance (62) [15],[16],[22]   (62) [15],[16],[22]   0 [19],[20],[24]                
Investment, Identifier [Axis]: Eclipse Buyer Inc.| First lien - Undrawn 1                          
Principal Amount or Par Value [15],[21],[22],[25] 1,206   1,206                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[22],[25] (18)   (18)                    
Investment, Identifier [Axis]: Eclipse Topco Holdings, Inc. (fka Transcendia Holdings, Inc.) | Ordinary Shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16] 0   0                    
Investment, Identifier [Axis]: Eclipse Topco Holdings, Inc. (fka Transcendia Holdings, Inc.) | Ordinary shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20]     0                    
Fair value, ending balance [19],[20]         0                
Investment, Identifier [Axis]: Eclipse Topco Holdings, Inc. (fka Transcendia Holdings, Inc.) | Series A Preferred Shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16] 3,835   3,835                    
Investment, Identifier [Axis]: Eclipse Topco Holdings, Inc. (fka Transcendia Holdings, Inc.) | Series A preferred shares                          
Principal Amount or Par Value 3,835   3,835   3,335                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20]     3,335                    
Fair value, ending balance [19],[20]         3,335                
Investment, Identifier [Axis]: Eclipse Topco Holdings, Inc. (fka Transcendia Holdings, Inc.) | Series B Preferred Shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16] 3,009   3,009                    
Investment, Identifier [Axis]: Eclipse Topco Holdings, Inc. (fka Transcendia Holdings, Inc.) | Series B preferred shares                          
Principal Amount or Par Value 3,691   3,691   4,116                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20]     3,009                    
Fair value, ending balance [19],[20]         3,009                
Investment, Identifier [Axis]: Eclipse Topco, Inc. | Preferred Shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[25],[45] 1,632   1,632                    
Investment, Identifier [Axis]: Eclipse Topco, Inc. | Preferred shares                          
Principal Amount or Par Value 1,632   1,632   2,226                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[31],[46]     2,228                    
Fair value, ending balance [19],[31],[46]         2,228                
Investment, Identifier [Axis]: Edmentum Ultimate Holdings, LLC | Subordinated                          
Principal Amount or Par Value 29,089 [8],[15],[16],[21],[47]   29,089 [8],[15],[16],[21],[47]   26,646 [3],[19],[20],[23],[48]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [3],[19],[20],[48]     26,646                    
Fair value, ending balance 29,089 [8],[15],[16],[47]   29,089 [8],[15],[16],[47]   26,646 [3],[19],[20],[48]                
Investment, Identifier [Axis]: Einstein Parent, Inc. | First lien - Undrawn                          
Principal Amount or Par Value 5,750 [15],[16],[21],[22]   5,750 [15],[16],[21],[22]   5,750 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     (57)                    
Fair value, ending balance (138) [15],[16],[22]   (138) [15],[16],[22]   (57) [19],[20],[24]                
Investment, Identifier [Axis]: Einstein Parent, Inc. | First lien 1                          
Principal Amount or Par Value $ 35,582 [15],[16],[21],[32]   $ 35,582 [15],[16],[21],[32]   $ 35,582 [19],[20],[23],[28]                
Spread 5.25% [15],[16],[32]   5.25% [15],[16],[32]   6.50% [19],[20],[28] 5.25% [15],[16],[32] 5.25% [15],[16],[32] 6.50% [19],[20],[28] 6.50% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 35,226                    
Fair value, ending balance $ 34,728 [15],[16],[32]   34,728 [15],[16],[32]   $ 35,226 [19],[20],[28]                
Investment, Identifier [Axis]: Einstein Parent, Inc. | First lien 2                          
Principal Amount or Par Value $ 20,000 [15],[21],[29],[30]   $ 20,000 [15],[21],[29],[30]   $ 20,000 [19],[23],[26],[27]                
Spread 5.25% [15],[29],[30]   5.25% [15],[29],[30]   6.50% [19],[26],[27] 5.25% [15],[29],[30] 5.25% [15],[29],[30] 6.50% [19],[26],[27] 6.50% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 19,800                    
Fair value, ending balance $ 19,520 [15],[29],[30]   $ 19,520 [15],[29],[30]   $ 19,800 [19],[26],[27]                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC | First lien                          
Number of investments held | investment 5   5   5 5 5 5 5        
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC | First lien - Drawn 1                          
Principal Amount or Par Value [19],[23],[24],[41]         $ 2,533                
Spread [19],[24],[41]         5.25%     5.25% 5.25%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[24],[41]     $ 2,533                    
Fair value, ending balance [19],[24],[41]         $ 2,533                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC | First lien - Undrawn                          
Principal Amount or Par Value [15],[16],[21],[22] $ 1,400   1,400                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC | First lien - Undrawn 1                          
Principal Amount or Par Value [19],[20],[23],[24]         64                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance [19],[20],[24]         0                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC | First lien - Undrawn 2                          
Principal Amount or Par Value [19],[23],[24],[41]         191                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[24],[41]     0                    
Fair value, ending balance [19],[24],[41]         0                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC | First lien - Undrawn 3                          
Principal Amount or Par Value [19],[20],[23],[24]         1,400                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance [19],[20],[24]         0                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC | First lien 1                          
Principal Amount or Par Value $ 8,396 [15],[21],[40]   $ 8,396 [15],[21],[40]   $ 8,449 [19],[23],[41]                
Spread 5.00% [15],[40]   5.00% [15],[40]   5.25% [19],[41] 5.00% [15],[40] 5.00% [15],[40] 5.25% [19],[41] 5.25% [19],[41]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[41]     $ 8,449                    
Fair value, ending balance $ 8,396 [15],[40]   8,396 [15],[40]   $ 8,449 [19],[41]                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC | First lien 2                          
Principal Amount or Par Value $ 4,681 [15],[16],[21],[32]   $ 4,681 [15],[16],[21],[32]   $ 4,710 [19],[20],[23],[28]                
Spread 5.00% [15],[16],[32]   5.00% [15],[16],[32]   5.25% [19],[20],[28] 5.00% [15],[16],[32] 5.00% [15],[16],[32] 5.25% [19],[20],[28] 5.25% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 4,710                    
Fair value, ending balance $ 4,681 [15],[16],[32]   4,681 [15],[16],[32]   $ 4,710 [19],[20],[28]                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC | First lien 3                          
Principal Amount or Par Value $ 2,819 [15],[21],[40]   $ 2,819 [15],[21],[40]   $ 2,836 [19],[23],[41]                
Spread 5.00% [15],[40]   5.00% [15],[40]   5.25% [19],[41] 5.00% [15],[40] 5.00% [15],[40] 5.25% [19],[41] 5.25% [19],[41]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[41]     $ 2,836                    
Fair value, ending balance $ 2,819 [15],[40]   2,819 [15],[40]   $ 2,836 [19],[41]                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC | First lien 4                          
Principal Amount or Par Value $ 2,801 [15],[21],[40]   $ 2,801 [15],[21],[40]   $ 2,818 [19],[23],[41]                
Spread 5.00% [15],[40]   5.00% [15],[40]   5.25% [19],[41] 5.00% [15],[40] 5.00% [15],[40] 5.25% [19],[41] 5.25% [19],[41]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[41]     $ 2,818                    
Fair value, ending balance $ 2,801 [15],[40]   2,801 [15],[40]   $ 2,818 [19],[41]                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC | First lien 5                          
Principal Amount or Par Value [15],[21],[40] $ 2,711   $ 2,711                    
Spread [15],[40] 5.00%   5.00%     5.00% 5.00%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[40] $ 2,711   $ 2,711                    
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC | First lien 6                          
Principal Amount or Par Value [15],[16],[21],[32] $ 905   $ 905                    
Spread [15],[16],[32] 5.00%   5.00%     5.00% 5.00%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[32] $ 905   $ 905                    
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC | First lien- Drawn 2                          
Principal Amount or Par Value [19],[20],[23],[24],[28]         $ 846                
Spread [19],[20],[24],[28]         5.25%     5.25% 5.25%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24],[28]     846                    
Fair value, ending balance [19],[20],[24],[28]         $ 846                
Investment, Identifier [Axis]: FS WhiteWater Holdings, LLC | Ordinary Shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[40],[49] 6,088   6,088                    
Investment, Identifier [Axis]: FS WhiteWater Holdings, LLC | Ordinary shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[41],[50]     5,357                    
Fair value, ending balance [19],[41],[50]         5,357                
Investment, Identifier [Axis]: Firebird Acquisition Corp, Inc. | First lien                          
Principal Amount or Par Value [19],[20],[23],[28]         $ 8,187                
Spread [19],[20],[28],[34]         2.25%     2.25% 2.25%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     8,167                    
Fair value, ending balance [19],[20],[28]         $ 8,167                
Investment, Identifier [Axis]: Firebird Acquisition Corp, Inc. | First lien - Drawn                          
Principal Amount or Par Value $ 2,794 [15],[16],[21],[22]   $ 2,794 [15],[16],[21],[22]   $ 1,919 [19],[20],[23],[24]                
Spread 4.50% [15],[16],[22]   4.50% [15],[16],[22]   4.50% [19],[20],[24] 4.50% [15],[16],[22] 4.50% [15],[16],[22] 4.50% [19],[20],[24] 4.50% [19],[20],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     $ 1,914                    
Fair value, ending balance $ 2,794 [15],[16],[22]   2,794 [15],[16],[22]   $ 1,914 [19],[20],[24]                
Investment, Identifier [Axis]: Firebird Acquisition Corp, Inc. | First lien - Undrawn 1                          
Principal Amount or Par Value [19],[20],[23],[24]         1,422                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     (4)                    
Fair value, ending balance [19],[20],[24]         (4)                
Investment, Identifier [Axis]: Firebird Acquisition Corp, Inc. | First lien - Undrawn 2                          
Principal Amount or Par Value 1,422 [15],[16],[21],[22]   1,422 [15],[16],[21],[22]   2,814 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     (7)                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   (7) [19],[20],[24]                
Investment, Identifier [Axis]: Firebird Acquisition Corp, Inc. | First lien - Undrawn1                          
Principal Amount or Par Value [15],[16],[21],[22] 1,926   1,926                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: Firebird Acquisition Corp, Inc. | First lien 1                          
Principal Amount or Par Value [15],[16],[21],[32] $ 8,261   $ 8,261                    
Spread [15],[16],[32],[35] 2.25%   2.25%     2.25% 2.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[32] $ 8,261   $ 8,261                    
Investment, Identifier [Axis]: Firebird Co-Invest L.P. | LP Interest                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[51]     3,358                    
Fair value, ending balance 4,209 [15],[16],[52]   4,209 [15],[16],[52]   3,358 [19],[20],[51]                
Investment, Identifier [Axis]: Flash Charm Inc. (fka Idera, Inc.) | Second lien 1                          
Principal Amount or Par Value $ 1,884 [21],[25]   $ 1,884 [21],[25]   $ 6,474 [23],[31]                
Spread 6.75% [25]   6.75% [25]   6.75% [31] 6.75% [25] 6.75% [25] 6.75% [31] 6.75% [31]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [31]     $ 5,697                    
Fair value, ending balance $ 1,154 [25]   1,154 [25]   $ 5,697 [31]                
Investment, Identifier [Axis]: Flash Charm Inc. (fka Idera, Inc.) | Second lien 2                          
Principal Amount or Par Value $ 251 [16],[21],[32]   $ 251 [16],[21],[32]   $ 863 [20],[23],[28]                
Spread 6.75% [16],[32]   6.75% [16],[32]   6.75% [20],[28] 6.75% [16],[32] 6.75% [16],[32] 6.75% [20],[28] 6.75% [20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [20],[28]     $ 760                    
Fair value, ending balance $ 154 [16],[32]   154 [16],[32]   $ 760 [20],[28]                
Investment, Identifier [Axis]: Foreside Financial Group, LLC | First lien - Drawn                          
Principal Amount or Par Value $ 92 [15],[16],[21],[22],[32]   $ 92 [15],[16],[21],[22],[32]   $ 460 [19],[20],[23],[24]                
Spread 5.25% [15],[16],[22],[32]   5.25% [15],[16],[22],[32]   5.25% [19],[20],[24] 5.25% [15],[16],[22],[32] 5.25% [15],[16],[22],[32] 5.25% [19],[20],[24] 5.25% [19],[20],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     $ 460                    
Fair value, ending balance $ 92 [15],[16],[22],[32]   92 [15],[16],[22],[32]   $ 460 [19],[20],[24]                
Investment, Identifier [Axis]: Foreside Financial Group, LLC | First lien - Undrawn                          
Principal Amount or Par Value [15],[16],[21],[22] 2,218   2,218                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: Foreside Financial Group, LLC | First lien - Undrawn 1                          
Principal Amount or Par Value [19],[20],[23],[24]         2,849                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance [19],[20],[24]         0                
Investment, Identifier [Axis]: Foreside Financial Group, LLC | First lien - Undrawn 2                          
Principal Amount or Par Value [19],[20],[23],[24]         2,311                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance [19],[20],[24]         0                
Investment, Identifier [Axis]: Foreside Financial Group, LLC | First lien 1                          
Principal Amount or Par Value $ 7,746 [15],[21],[29],[30]   $ 7,746 [15],[21],[29],[30]   $ 36,810 [19],[23],[26],[27]                
Spread 5.25% [15],[29],[30]   5.25% [15],[29],[30]   5.25% [19],[26],[27] 5.25% [15],[29],[30] 5.25% [15],[29],[30] 5.25% [19],[26],[27] 5.25% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 36,810                    
Fair value, ending balance $ 7,746 [15],[29],[30]   7,746 [15],[29],[30]   $ 36,810 [19],[26],[27]                
Investment, Identifier [Axis]: Foreside Financial Group, LLC | First lien 2                          
Principal Amount or Par Value $ 273 [15],[16],[21],[32]   $ 273 [15],[16],[21],[32]   $ 4,033 [19],[20],[23],[28]                
Spread 5.25% [15],[16],[32]   5.25% [15],[16],[32]   5.25% [19],[20],[28] 5.25% [15],[16],[32] 5.25% [15],[16],[32] 5.25% [19],[20],[28] 5.25% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 4,033                    
Fair value, ending balance $ 273 [15],[16],[32]   273 [15],[16],[32]   $ 4,033 [19],[20],[28]                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC | First lien - Drawn                          
Principal Amount or Par Value $ 1,573 [15],[16],[21],[22],[32]   $ 1,573 [15],[16],[21],[22],[32]   $ 834 [19],[20],[23],[24],[28]                
Spread 5.50% [15],[16],[22],[32]   5.50% [15],[16],[22],[32]   5.50% [19],[20],[24],[28] 5.50% [15],[16],[22],[32] 5.50% [15],[16],[22],[32] 5.50% [19],[20],[24],[28] 5.50% [19],[20],[24],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24],[28]     $ 834                    
Fair value, ending balance $ 1,573 [15],[16],[22],[32]   1,573 [15],[16],[22],[32]   $ 834 [19],[20],[24],[28]                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC | First lien - Undrawn                          
Principal Amount or Par Value 1,287 [15],[16],[21],[22]   1,287 [15],[16],[21],[22]   2,026 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [19],[20],[24]                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC | First lien 1                          
Principal Amount or Par Value $ 29,082 [15],[21],[29],[30]   $ 29,082 [15],[21],[29],[30]   $ 29,234 [19],[23],[26],[27]                
Spread 5.50% [15],[29],[30]   5.50% [15],[29],[30]   5.50% [19],[26],[27] 5.50% [15],[29],[30] 5.50% [15],[29],[30] 5.50% [19],[26],[27] 5.50% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 29,234                    
Fair value, ending balance $ 29,082 [15],[29],[30]   29,082 [15],[29],[30]   $ 29,234 [19],[26],[27]                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC | First lien 2                          
Principal Amount or Par Value $ 967 [15],[16],[21],[32]   $ 967 [15],[16],[21],[32]   $ 972 [19],[20],[23],[28]                
Spread 5.50% [15],[16],[32]   5.50% [15],[16],[32]   5.50% [19],[20],[28] 5.50% [15],[16],[32] 5.50% [15],[16],[32] 5.50% [19],[20],[28] 5.50% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 972                    
Fair value, ending balance $ 967 [15],[16],[32]   967 [15],[16],[32]   $ 972 [19],[20],[28]                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC | First lien 3                          
Principal Amount or Par Value $ 78 [15],[16],[21]   $ 78 [15],[16],[21]   $ 79 [19],[20],[23]                
Spread 5.50% [15],[16]   5.50% [15],[16]   5.50% [19],[20] 5.50% [15],[16] 5.50% [15],[16] 5.50% [19],[20] 5.50% [19],[20]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20]     $ 79                    
Fair value, ending balance $ 78 [15],[16]   78 [15],[16]   $ 79 [19],[20]                
Investment, Identifier [Axis]: Foundational Education Group, Inc. | First lien                          
Principal Amount or Par Value $ 6,317 [15],[21],[29],[30]   $ 6,317 [15],[21],[29],[30]   $ 6,350 [23],[26],[27]                
Spread 4.25% [15],[29],[30]   4.25% [15],[29],[30]   3.75% [26],[27] 4.25% [15],[29],[30] 4.25% [15],[29],[30] 3.75% [26],[27] 3.75% [26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [26],[27]     $ 5,871                    
Fair value, ending balance $ 5,875 [15],[29],[30]   5,875 [15],[29],[30]   $ 5,871 [26],[27]                
Investment, Identifier [Axis]: Foundational Education Group, Inc. | Second lien 1                          
Principal Amount or Par Value $ 22,500 [15],[21],[40]   $ 22,500 [15],[21],[40]   $ 22,500 [19],[23],[41]                
Spread 6.50% [15],[40]   6.50% [15],[40]   6.50% [19],[41] 6.50% [15],[40] 6.50% [15],[40] 6.50% [19],[41] 6.50% [19],[41]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[41]     $ 22,500                    
Fair value, ending balance $ 22,500 [15],[40]   22,500 [15],[40]   $ 22,500 [19],[41]                
Investment, Identifier [Axis]: Foundational Education Group, Inc. | Second lien 2                          
Principal Amount or Par Value $ 10,965 [15],[16],[21],[32]   $ 10,965 [15],[16],[21],[32]   $ 10,965 [19],[20],[23],[28]                
Spread 6.50% [15],[16],[32]   6.50% [15],[16],[32]   6.50% [19],[20],[28] 6.50% [15],[16],[32] 6.50% [15],[16],[32] 6.50% [19],[20],[28] 6.50% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 10,965                    
Fair value, ending balance $ 10,965 [15],[16],[32]   10,965 [15],[16],[32]   $ 10,965 [19],[20],[28]                
Investment, Identifier [Axis]: Fullsteam Operations LLC | First lien                          
Principal Amount or Par Value $ 6,223 [15],[21],[29],[30]   $ 6,223 [15],[21],[29],[30]   $ 6,223 [19],[23],[26],[27]                
Spread 5.25% [15],[29],[30]   5.25% [15],[29],[30]   5.25% [19],[26],[27] 5.25% [15],[29],[30] 5.25% [15],[29],[30] 5.25% [19],[26],[27] 5.25% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 6,192                    
Fair value, ending balance $ 6,192 [15],[29],[30]   6,192 [15],[29],[30]   $ 6,192 [19],[26],[27]                
Investment, Identifier [Axis]: Fullsteam Operations LLC | First lien - Drawn                          
Principal Amount or Par Value [15],[16],[21],[22] $ 225   $ 225                    
Spread [15],[16],[22] 5.25%   5.25%     5.25% 5.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] $ 224   $ 224                    
Investment, Identifier [Axis]: Fullsteam Operations LLC | First lien - Undrawn 1                          
Principal Amount or Par Value 467 [15],[16],[21],[22]   467 [15],[16],[21],[22]   691 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     (3)                    
Fair value, ending balance (2) [15],[16],[22]   (2) [15],[16],[22]   (3) [19],[20],[24]                
Investment, Identifier [Axis]: Fullsteam Operations LLC | First lien - Undrawn 2                          
Principal Amount or Par Value 2,074 [15],[16],[21],[22]   2,074 [15],[16],[21],[22]   2,074 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     (10)                    
Fair value, ending balance (10) [15],[16],[22]   (10) [15],[16],[22]   (10) [19],[20],[24]                
Investment, Identifier [Axis]: GC Waves Holdings, Inc. | First lien                          
Principal Amount or Par Value [15],[21],[40] $ 21,126   $ 21,126                    
Spread [15],[40] 4.50%   4.50%     4.50% 4.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[40] $ 21,126   $ 21,126                    
Investment, Identifier [Axis]: GC Waves Holdings, Inc. | First lien - Undrawn                          
Principal Amount or Par Value 3,951 [15],[16],[21],[22]   3,951 [15],[16],[21],[22]   3,951 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [19],[20],[24]                
Investment, Identifier [Axis]: GC Waves Holdings, Inc. | First lien 1                          
Principal Amount or Par Value [19],[23],[26],[27]         $ 35,918                
Spread [19],[26],[27]         4.50%     4.50% 4.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     35,918                    
Fair value, ending balance [19],[26],[27]         $ 35,918                
Investment, Identifier [Axis]: GC Waves Holdings, Inc. | First lien 2                          
Principal Amount or Par Value [19],[23],[41]         $ 21,233                
Spread [19],[41]         4.50%     4.50% 4.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[41]     21,233                    
Fair value, ending balance [19],[41]         $ 21,233                
Investment, Identifier [Axis]: GEDC Equity, LLC | Participation Interest                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20]     50                    
Fair value, ending balance 0 [15],[16]   0 [15],[16]   50 [19],[20]                
Investment, Identifier [Axis]: GS Acquisitionco, Inc. | First lien - Drawn                          
Principal Amount or Par Value [15],[16],[21],[22] $ 4,818   $ 4,818                    
Spread [15],[16],[22] 5.25%   5.25%     5.25% 5.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] $ 4,522   $ 4,522                    
Investment, Identifier [Axis]: GS Acquisitionco, Inc. | First lien - Drawn 1                          
Principal Amount or Par Value [19],[20],[23],[24]         $ 1,786                
Spread [19],[20],[24]         5.25%     5.25% 5.25%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     1,786                    
Fair value, ending balance [19],[20],[24]         $ 1,786                
Investment, Identifier [Axis]: GS Acquisitionco, Inc. | First lien - Drawn 2                          
Principal Amount or Par Value [19],[20],[23],[24]         $ 448                
Spread [19],[20],[24]         5.25%     5.25% 5.25%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     448                    
Fair value, ending balance [19],[20],[24]         $ 448                
Investment, Identifier [Axis]: GS Acquisitionco, Inc. | First lien - Undrawn                          
Principal Amount or Par Value [15],[16],[21],[22] 3   3                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: GS Acquisitionco, Inc. | First lien - Undrawn 1                          
Principal Amount or Par Value [19],[20],[23],[24]         759                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance [19],[20],[24]         0                
Investment, Identifier [Axis]: GS Acquisitionco, Inc. | First lien - Undrawn 2                          
Principal Amount or Par Value [19],[20],[23],[24]         3,036                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance [19],[20],[24]         0                
Investment, Identifier [Axis]: GS Acquisitionco, Inc. | First lien 1                          
Principal Amount or Par Value $ 20,962 [15],[21],[40]   $ 20,962 [15],[21],[40]   $ 25,079 [19],[23],[26],[27]                
Spread 5.25% [15],[40]   5.25% [15],[40]   5.25% [19],[26],[27] 5.25% [15],[40] 5.25% [15],[40] 5.25% [19],[26],[27] 5.25% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 25,079                    
Fair value, ending balance $ 19,673 [15],[40]   19,673 [15],[40]   $ 25,079 [19],[26],[27]                
Investment, Identifier [Axis]: GS Acquisitionco, Inc. | First lien 2                          
Principal Amount or Par Value $ 446 [15],[16],[21]   $ 446 [15],[16],[21]   $ 21,074 [19],[23],[41]                
Spread 5.25% [15],[16]   5.25% [15],[16]   5.25% [19],[41] 5.25% [15],[16] 5.25% [15],[16] 5.25% [19],[41] 5.25% [19],[41]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[41]     $ 21,074                    
Fair value, ending balance $ 419 [15],[16]   419 [15],[16]   $ 21,074 [19],[41]                
Investment, Identifier [Axis]: GS Acquisitionco, Inc. | First lien 3                          
Principal Amount or Par Value [19],[20],[23],[28]         $ 2,878                
Spread [19],[20],[28]         5.25%     5.25% 5.25%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     2,878                    
Fair value, ending balance [19],[20],[28]         $ 2,878                
Investment, Identifier [Axis]: Greenway Health, LLC | First lien                          
Principal Amount or Par Value $ 6,206 [15],[16],[21],[32]   $ 6,206 [15],[16],[21],[32]   $ 6,238 [19],[20],[23],[28]                
Spread 6.75% [15],[16],[32]   6.75% [15],[16],[32]   6.75% [19],[20],[28] 6.75% [15],[16],[32] 6.75% [15],[16],[32] 6.75% [19],[20],[28] 6.75% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 6,238                    
Fair value, ending balance $ 6,085 [15],[16],[32]   $ 6,085 [15],[16],[32]   $ 6,238 [19],[20],[28]                
Investment, Identifier [Axis]: HBWM Holdings, LLC | Common Units                          
Spread [15],[35],[53],[54] 4.00%   4.00%     4.00% 4.00%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[53],[54] $ 10,922   $ 10,922                    
Investment, Identifier [Axis]: HBWM Holdings, LLC | Common units                          
Principal Amount or Par Value 4,810   4,810   $ 4,776                
Spread [19],[34],[55],[56]         4.00%     4.00% 4.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[55],[56]     10,854                    
Fair value, ending balance [19],[55],[56]         $ 10,854                
Investment, Identifier [Axis]: HP TLE Buyer, Inc. | First lien                          
Principal Amount or Par Value $ 8,168 [15],[21],[29],[30]   $ 8,168 [15],[21],[29],[30]   $ 8,168 [19],[23],[26],[27]                
Spread 4.75% [15],[29],[30]   4.75% [15],[29],[30]   4.75% [19],[26],[27] 4.75% [15],[29],[30] 4.75% [15],[29],[30] 4.75% [19],[26],[27] 4.75% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 8,127                    
Fair value, ending balance $ 8,168 [15],[29],[30]   8,168 [15],[29],[30]   $ 8,127 [19],[26],[27]                
Investment, Identifier [Axis]: HP TLE Buyer, Inc. | First lien - Undrawn                          
Principal Amount or Par Value 1,797 [15],[16],[21],[22]   1,797 [15],[16],[21],[22]   1,797 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     (9)                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   (9) [19],[20],[24]                
Investment, Identifier [Axis]: HS Purchaser, LLC / Help/Systems Holdings, Inc. | Second lien 1                          
Principal Amount or Par Value 24,854 [15],[21],[40]   24,854 [15],[21],[40]   23,738 [19],[23],[41]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[41]     19,640                    
Fair value, ending balance 15,345 [15],[40]   15,345 [15],[40]   19,640 [19],[41]                
Investment, Identifier [Axis]: HS Purchaser, LLC / Help/Systems Holdings, Inc. | Second lien 2                          
Principal Amount or Par Value 4,648 [15],[21],[30]   4,648 [15],[21],[30]   4,440 [19],[23],[26],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     3,673                    
Fair value, ending balance 2,870 [15],[30]   2,870 [15],[30]   3,673 [19],[26],[27]                
Investment, Identifier [Axis]: Healthspan Buyer, LLC | First lien                          
Principal Amount or Par Value [19],[20],[23],[28]         $ 5,018                
Spread [19],[20],[28]         4.75%     4.75% 4.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     5,018                    
Fair value, ending balance [19],[20],[28]         $ 5,018                
Investment, Identifier [Axis]: Healthspan Buyer, LLC | First lien - Undrawn                          
Principal Amount or Par Value 1,229 [15],[16],[21],[22]   1,229 [15],[16],[21],[22]   1,229 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [19],[20],[24]                
Investment, Identifier [Axis]: Healthspan Buyer, LLC | First lien 1                          
Principal Amount or Par Value [15],[21],[29],[30] $ 32,320   $ 32,320                    
Spread [15],[29],[30] 4.75%   4.75%     4.75% 4.75%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[29],[30] $ 32,320   $ 32,320                    
Investment, Identifier [Axis]: Healthspan Buyer, LLC | First lien 2                          
Principal Amount or Par Value [15],[16],[21],[32] $ 4,992   $ 4,992                    
Spread [15],[16],[32] 4.75%   4.75%     4.75% 4.75%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[32] $ 4,992   $ 4,992                    
Investment, Identifier [Axis]: Houghton Mifflin Harcourt Company | First lien                          
Principal Amount or Par Value $ 14,262 [21],[29],[30]   $ 14,262 [21],[29],[30]   $ 14,336 [23],[26],[27]                
Spread 5.25% [29],[30]   5.25% [29],[30]   5.25% [26],[27] 5.25% [29],[30] 5.25% [29],[30] 5.25% [26],[27] 5.25% [26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [26],[27]     $ 12,689                    
Fair value, ending balance $ 11,331 [29],[30]   11,331 [29],[30]   $ 12,689 [26],[27]                
Investment, Identifier [Axis]: IG Investments Holdings, LLC | First lien - Undrawn                          
Principal Amount or Par Value 3,780 [15],[16],[21],[22]   3,780 [15],[16],[21],[22]   3,780 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [19],[20],[24]                
Investment, Identifier [Axis]: IG Investments Holdings, LLC | First lien 1                          
Principal Amount or Par Value $ 32,307 [15],[21],[29],[30]   $ 32,307 [15],[21],[29],[30]   $ 32,471 [19],[23],[26],[27]                
Spread 5.00% [15],[29],[30]   5.00% [15],[29],[30]   5.00% [19],[26],[27] 5.00% [15],[29],[30] 5.00% [15],[29],[30] 5.00% [19],[26],[27] 5.00% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 32,471                    
Fair value, ending balance $ 32,307 [15],[29],[30]   32,307 [15],[29],[30]   $ 32,471 [19],[26],[27]                
Investment, Identifier [Axis]: IG Investments Holdings, LLC | First lien 2                          
Principal Amount or Par Value $ 2,504 [15],[16],[21],[32]   $ 2,504 [15],[16],[21],[32]   $ 2,517 [19],[20],[23],[28]                
Spread 5.00% [15],[16],[32]   5.00% [15],[16],[32]   5.00% [19],[20],[28] 5.00% [15],[16],[32] 5.00% [15],[16],[32] 5.00% [19],[20],[28] 5.00% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 2,517                    
Fair value, ending balance $ 2,504 [15],[16],[32]   2,504 [15],[16],[32]   $ 2,517 [19],[20],[28]                
Investment, Identifier [Axis]: IMA Financial Group, Inc. | Class C Common Shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[32] 4,411   4,411                    
Investment, Identifier [Axis]: Icefall Parent, Inc. | First lien                          
Principal Amount or Par Value [15],[16],[21],[32] $ 4,828   $ 4,828                    
Spread [15],[16],[32] 4.50%   4.50%     4.50% 4.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[32] $ 4,828   $ 4,828                    
Investment, Identifier [Axis]: Icefall Parent, Inc. | First lien - Undrawn                          
Principal Amount or Par Value [15],[16],[21],[22] 475   475                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: Infogain Corporation | First lien - Undrawn                          
Principal Amount or Par Value 3,593 [15],[16],[21],[22]   3,593 [15],[16],[21],[22]   3,827 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [19],[20],[24]                
Investment, Identifier [Axis]: Infogain Corporation | First lien 1                          
Principal Amount or Par Value $ 7,645 [15],[21],[29],[30]   $ 7,645 [15],[21],[29],[30]   $ 18,324 [19],[23],[26],[27]                
Spread 5.75% [15],[29],[30]   5.75% [15],[29],[30]   5.75% [19],[26],[27] 5.75% [15],[29],[30] 5.75% [15],[29],[30] 5.75% [19],[26],[27] 5.75% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 18,324                    
Fair value, ending balance $ 7,645 [15],[29],[30]   7,645 [15],[29],[30]   $ 18,324 [19],[26],[27]                
Investment, Identifier [Axis]: Infogain Corporation | First lien 2                          
Principal Amount or Par Value $ 234 [15],[16],[21],[22]   $ 234 [15],[16],[21],[22]   $ 7,685 [19],[23],[26],[27]                
Spread 5.75% [15],[16],[22]   5.75% [15],[16],[22]   5.75% [19],[26],[27] 5.75% [15],[16],[22] 5.75% [15],[16],[22] 5.75% [19],[26],[27] 5.75% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 7,685                    
Fair value, ending balance $ 234 [15],[16],[22]   234 [15],[16],[22]   $ 7,685 [19],[26],[27]                
Investment, Identifier [Axis]: Infogain Corporation | Subordinated                          
Principal Amount or Par Value $ 6,265 [15],[16],[21]   $ 6,265 [15],[16],[21]   $ 16,661 [19],[20],[23]                
Spread 7.50% [15],[16]   7.50% [15],[16]   7.50% [19],[20] 7.50% [15],[16] 7.50% [15],[16] 7.50% [19],[20] 7.50% [19],[20]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20]     $ 16,661                    
Fair value, ending balance $ 6,265 [15],[16]   6,265 [15],[16]   $ 16,661 [19],[20]                
Investment, Identifier [Axis]: Ivy Hill Middle Market Credit Fund, Ltd | Structured Finance Obligation                          
Principal Amount or Par Value 3,232 [15],[16],[21],[38]   3,232 [15],[16],[21],[38]   $ 3,232 [19],[20],[23],[39]                
Spread [19],[20],[39]         7.00%     7.00% 7.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[39]     3,277                    
Fair value, ending balance 3,191 [15],[16],[38]   3,191 [15],[16],[38]   $ 3,277 [19],[20],[39]                
Investment, Identifier [Axis]: Jawbreaker Parent, Inc. | First lien - Undrawn 1                          
Principal Amount or Par Value [15],[16],[21],[22] 1,503   1,503                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] (8)   (8)                    
Investment, Identifier [Axis]: Jawbreaker Parent, Inc. | First lien - Undrawn 2                          
Principal Amount or Par Value [15],[16],[21],[22] 1,503   1,503                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] (8)   (8)                    
Investment, Identifier [Axis]: Jawbreaker Parent, Inc. | First lien 1                          
Principal Amount or Par Value [15],[21],[29],[30] $ 7,796   $ 7,796                    
Spread [15],[29],[30] 4.75%   4.75%     4.75% 4.75%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[29],[30] $ 7,757   $ 7,757                    
Investment, Identifier [Axis]: Jawbreaker Parent, Inc. | First lien 2                          
Principal Amount or Par Value [15],[16],[21],[32] $ 3,728   $ 3,728                    
Spread [15],[16],[32] 4.75%   4.75%     4.75% 4.75%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[32] $ 3,709   $ 3,709                    
Investment, Identifier [Axis]: Jawbreaker Topco, Inc. | First lien                          
Number of investments held | investment 2   2     2 2            
Investment, Identifier [Axis]: Jawbreaker Topco, L.P. | Class A-1 Common Units                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[57] $ 2,476   $ 2,476                    
Investment, Identifier [Axis]: KPSKY Acquisition Inc. | First lien 1                          
Principal Amount or Par Value $ 6,721 [15],[16],[21],[32]   $ 6,721 [15],[16],[21],[32]   $ 6,756 [19],[20],[23],[28]                
Spread 5.50% [15],[16],[32]   5.50% [15],[16],[32]   5.50% [19],[20],[28] 5.50% [15],[16],[32] 5.50% [15],[16],[32] 5.50% [19],[20],[28] 5.50% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 6,331                    
Fair value, ending balance $ 6,157 [15],[16],[32]   6,157 [15],[16],[32]   $ 6,331 [19],[20],[28]                
Investment, Identifier [Axis]: KPSKY Acquisition Inc. | First lien 2                          
Principal Amount or Par Value $ 1,131 [15],[16],[21],[32]   $ 1,131 [15],[16],[21],[32]   $ 1,137 [19],[20],[23],[28]                
Spread 5.50% [15],[16],[32]   5.50% [15],[16],[32]   5.50% [19],[20],[28] 5.50% [15],[16],[32] 5.50% [15],[16],[32] 5.50% [19],[20],[28] 5.50% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 1,066                    
Fair value, ending balance $ 1,036 [15],[16],[32]   1,036 [15],[16],[32]   $ 1,066 [19],[20],[28]                
Investment, Identifier [Axis]: KPSKY Acquisition Inc. | First lien 3                          
Principal Amount or Par Value $ 770 [15],[16],[21],[32]   $ 770 [15],[16],[21],[32]   $ 774 [19],[20],[23],[28]                
Spread 5.50% [15],[16],[32]   5.50% [15],[16],[32]   5.50% [19],[20],[28] 5.50% [15],[16],[32] 5.50% [15],[16],[32] 5.50% [19],[20],[28] 5.50% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 726                    
Fair value, ending balance $ 706 [15],[16],[32]   706 [15],[16],[32]   $ 726 [19],[20],[28]                
Investment, Identifier [Axis]: KPSKY Acquisition Inc. | First lien 4                          
Principal Amount or Par Value $ 19 [15],[16],[21]   $ 19 [15],[16],[21]   $ 19 [19],[20],[23]                
Spread 5.75% [15],[16]   5.75% [15],[16]   5.75% [19],[20] 5.75% [15],[16] 5.75% [15],[16] 5.75% [19],[20] 5.75% [19],[20]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20]     $ 18                    
Fair value, ending balance $ 17 [15],[16]   17 [15],[16]   $ 18 [19],[20]                
Investment, Identifier [Axis]: Kele Holdco, Inc. | First lien - Drawn                          
Principal Amount or Par Value $ 1,079 [15],[16],[21],[22],[32]   $ 1,079 [15],[16],[21],[22],[32]   $ 270 [19],[20],[23],[24],[28]                
Spread 4.50% [15],[16],[22],[32]   4.50% [15],[16],[22],[32]   4.50% [19],[20],[24],[28] 4.50% [15],[16],[22],[32] 4.50% [15],[16],[22],[32] 4.50% [19],[20],[24],[28] 4.50% [19],[20],[24],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24],[28]     $ 270                    
Fair value, ending balance $ 1,079 [15],[16],[22],[32]   1,079 [15],[16],[22],[32]   $ 270 [19],[20],[24],[28]                
Investment, Identifier [Axis]: Kele Holdco, Inc. | First lien - Undrawn                          
Principal Amount or Par Value 720 [15],[16],[21],[22]   720 [15],[16],[21],[22]   1,529 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [19],[20],[24]                
Investment, Identifier [Axis]: Kele Holdco, Inc. | First lien 1                          
Principal Amount or Par Value $ 14,392 [15],[21],[40]   $ 14,392 [15],[21],[40]   $ 14,473 [19],[23],[41]                
Spread 4.50% [15],[40]   4.50% [15],[40]   4.50% [19],[41] 4.50% [15],[40] 4.50% [15],[40] 4.50% [19],[41] 4.50% [19],[41]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[41]     $ 14,473                    
Fair value, ending balance $ 14,392 [15],[40]   14,392 [15],[40]   $ 14,473 [19],[41]                
Investment, Identifier [Axis]: Kele Holdco, Inc. | First lien 2                          
Principal Amount or Par Value $ 1,109 [15],[21],[40]   $ 1,109 [15],[21],[40]   $ 1,241 [19],[23],[41]                
Spread 4.50% [15],[40]   4.50% [15],[40]   4.50% [19],[41] 4.50% [15],[40] 4.50% [15],[40] 4.50% [19],[41] 4.50% [19],[41]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[41]     $ 1,241                    
Fair value, ending balance $ 1,109 [15],[40]   1,109 [15],[40]   $ 1,241 [19],[41]                
Investment, Identifier [Axis]: Knockout Intermediate Holdings I Inc. | Preferred Shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[58] 9,294   9,294                    
Investment, Identifier [Axis]: Knockout Intermediate Holdings I Inc. | Preferred shares                          
Principal Amount or Par Value 14,279   14,279   13,323                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[59]     13,324                    
Fair value, ending balance [19],[20],[59]         13,324                
Investment, Identifier [Axis]: Legends Hospitality Holding Company, LLC | First lien                          
Principal Amount or Par Value [19],[23],[41]         $ 6,250                
Spread [19],[34],[41]         2.75%     2.75% 2.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[41]     6,250                    
Fair value, ending balance [19],[41]         $ 6,250                
Investment, Identifier [Axis]: Legends Hospitality Holding Company, LLC | First lien - Drawn                          
Principal Amount or Par Value [15],[16],[21],[22] $ 197   $ 197                    
Spread [15],[16],[22] 5.00%   5.00%     5.00% 5.00%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] $ 193   $ 193                    
Investment, Identifier [Axis]: Legends Hospitality Holding Company, LLC | First lien - Drawn 1                          
Principal Amount or Par Value [19],[23],[24],[41]         $ 296                
Spread [19],[24],[41]         5.00%     5.00% 5.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[24],[41]     296                    
Fair value, ending balance [19],[24],[41]         $ 296                
Investment, Identifier [Axis]: Legends Hospitality Holding Company, LLC | First lien - Drawn 2                          
Principal Amount or Par Value [19],[20],[23],[24]         $ 233                
Spread [19],[20],[24]         5.00%     5.00% 5.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     233                    
Fair value, ending balance [19],[20],[24]         $ 233                
Investment, Identifier [Axis]: Legends Hospitality Holding Company, LLC | First lien - Undrawn                          
Principal Amount or Par Value [15],[16],[21],[22] 519   519                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] (10)   (10)                    
Investment, Identifier [Axis]: Legends Hospitality Holding Company, LLC | First lien - Undrawn 1                          
Principal Amount or Par Value [19],[23],[24],[41]         61                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[24],[41]     0                    
Fair value, ending balance [19],[24],[41]         0                
Investment, Identifier [Axis]: Legends Hospitality Holding Company, LLC | First lien - Undrawn 2                          
Principal Amount or Par Value [19],[20],[23],[24]         483                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance [19],[20],[24]         0                
Investment, Identifier [Axis]: Legends Hospitality Holding Company, LLC | First lien 1                          
Principal Amount or Par Value [15],[21],[40] $ 6,281   $ 6,281                    
Spread [15],[35],[40] 2.75%   2.75%     2.75% 2.75%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[40] $ 6,220   $ 6,220                    
Investment, Identifier [Axis]: Legends Hospitality Holding Company, LLC | First lien 2                          
Principal Amount or Par Value [15],[21],[40] $ 355   $ 355                    
Spread [15],[40] 5.00%   5.00%     5.00% 5.00%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[40] $ 348   $ 348                    
Investment, Identifier [Axis]: Logrhythm, Inc. | First lien                          
Principal Amount or Par Value $ 4,231 [15],[16],[21]   $ 4,231 [15],[16],[21]   $ 4,196 [19],[20],[23]                
Spread 1.12% [15],[16],[35]   1.12% [15],[16],[35]   7.50% [19],[20] 1.12% [15],[16],[35] 1.12% [15],[16],[35] 7.50% [19],[20] 7.50% [19],[20]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20]     $ 3,994                    
Fair value, ending balance $ 3,575 [15],[16]   3,575 [15],[16]   $ 3,994 [19],[20]                
Investment, Identifier [Axis]: Logrhythm, Inc. | First lien - Undrawn                          
Principal Amount or Par Value 420 [15],[16],[21],[22]   420 [15],[16],[21],[22]   420 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     (20)                    
Fair value, ending balance (65) [15],[16],[22]   (65) [15],[16],[22]   (20) [19],[20],[24]                
Investment, Identifier [Axis]: Low Voltage Holdings Inc. | First lien - Drawn                          
Principal Amount or Par Value [15],[16],[21],[22] $ 290   $ 290                    
Spread [15],[16],[22] 4.50%   4.50%     4.50% 4.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] $ 289   $ 289                    
Investment, Identifier [Axis]: Low Voltage Holdings Inc. | First lien - Undrawn 1                          
Principal Amount or Par Value 819 [15],[16],[21],[22]   819 [15],[16],[21],[22]   819 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     (3)                    
Fair value, ending balance (3) [15],[16],[22]   (3) [15],[16],[22]   (3) [19],[20],[24]                
Investment, Identifier [Axis]: Low Voltage Holdings Inc. | First lien - Undrawn 2                          
Principal Amount or Par Value 2,028 [15],[16],[21],[22]   2,028 [15],[16],[21],[22]   2,317 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     (9)                    
Fair value, ending balance (8) [15],[16],[22]   (8) [15],[16],[22]   (9) [19],[20],[24]                
Investment, Identifier [Axis]: Low Voltage Holdings Inc. | First lien - Undrawn 3                          
Principal Amount or Par Value 2,738 [15],[16],[21],[22]   2,738 [15],[16],[21],[22]   3,698 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     (14)                    
Fair value, ending balance (10) [15],[16],[22]   (10) [15],[16],[22]   (14) [19],[20],[24]                
Investment, Identifier [Axis]: Low Voltage Holdings Inc. | First lien 1                          
Principal Amount or Par Value $ 18,414 [15],[21],[29],[30]   $ 18,414 [15],[21],[29],[30]   $ 17,038 [19],[23],[26],[27]                
Spread 4.50% [15],[29],[30]   4.50% [15],[29],[30]   4.75% [19],[26],[27] 4.50% [15],[29],[30] 4.50% [15],[29],[30] 4.75% [19],[26],[27] 4.75% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 16,975                    
Fair value, ending balance $ 18,345 [15],[29],[30]   18,345 [15],[29],[30]   $ 16,975 [19],[26],[27]                
Investment, Identifier [Axis]: Low Voltage Holdings Inc. | First lien 2                          
Principal Amount or Par Value $ 958 [15],[16],[21],[32]   $ 958 [15],[16],[21],[32]   $ 1,422 [19],[20],[23],[28]                
Spread 4.50% [15],[16],[32]   4.50% [15],[16],[32]   4.75% [19],[20],[28] 4.50% [15],[16],[32] 4.50% [15],[16],[32] 4.75% [19],[20],[28] 4.75% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 1,417                    
Fair value, ending balance $ 954 [15],[16],[32]   954 [15],[16],[32]   $ 1,417 [19],[20],[28]                
Investment, Identifier [Axis]: MRI Software LLC | First lien - Drawn                          
Principal Amount or Par Value $ 501 [15],[16],[21],[22]   $ 501 [15],[16],[21],[22]   $ 400 [19],[20],[23],[24]                
Spread 4.75% [15],[16],[22]   4.75% [15],[16],[22]   4.75% [19],[20],[24] 4.75% [15],[16],[22] 4.75% [15],[16],[22] 4.75% [19],[20],[24] 4.75% [19],[20],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     $ 400                    
Fair value, ending balance $ 492 [15],[16],[22]   492 [15],[16],[22]   $ 400 [19],[20],[24]                
Investment, Identifier [Axis]: MRI Software LLC | First lien - Undrawn                          
Principal Amount or Par Value 1,502 [15],[16],[21],[22]   1,502 [15],[16],[21],[22]   1,602 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance (26) [15],[16],[22]   (26) [15],[16],[22]   0 [19],[20],[24]                
Investment, Identifier [Axis]: MRI Software LLC | First lien 1                          
Principal Amount or Par Value $ 21,092 [15],[21],[40]   $ 21,092 [15],[21],[40]   $ 21,205 [19],[23],[41]                
Spread 4.75% [15],[40]   4.75% [15],[40]   4.75% [19],[41] 4.75% [15],[40] 4.75% [15],[40] 4.75% [19],[41] 4.75% [19],[41]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[41]     $ 21,205                    
Fair value, ending balance $ 20,734 [15],[40]   20,734 [15],[40]   $ 21,205 [19],[41]                
Investment, Identifier [Axis]: MRI Software LLC | First lien 2                          
Principal Amount or Par Value $ 7,472 [15],[16],[21],[32]   $ 7,472 [15],[16],[21],[32]   $ 7,512 [19],[20],[23],[28]                
Spread 4.75% [15],[16],[32]   4.75% [15],[16],[32]   4.75% [19],[20],[28] 4.75% [15],[16],[32] 4.75% [15],[16],[32] 4.75% [19],[20],[28] 4.75% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 7,512                    
Fair value, ending balance $ 7,345 [15],[16],[32]   7,345 [15],[16],[32]   $ 7,512 [19],[20],[28]                
Investment, Identifier [Axis]: MRI Software LLC | First lien 3                          
Principal Amount or Par Value $ 4,450 [15],[21],[29],[30]   $ 4,450 [15],[21],[29],[30]   $ 4,474 [19],[23],[26],[27]                
Spread 4.75% [15],[29],[30]   4.75% [15],[29],[30]   4.75% [19],[26],[27] 4.75% [15],[29],[30] 4.75% [15],[29],[30] 4.75% [19],[26],[27] 4.75% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 4,474                    
Fair value, ending balance $ 4,375 [15],[29],[30]   4,375 [15],[29],[30]   $ 4,474 [19],[26],[27]                
Investment, Identifier [Axis]: MRI Software LLC | First lien 4                          
Principal Amount or Par Value $ 3,058 [15],[21],[29],[30]   $ 3,058 [15],[21],[29],[30]   $ 3,075 [19],[23],[26],[27]                
Spread 4.75% [15],[29],[30]   4.75% [15],[29],[30]   4.75% [19],[26],[27] 4.75% [15],[29],[30] 4.75% [15],[29],[30] 4.75% [19],[26],[27] 4.75% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 3,075                    
Fair value, ending balance $ 3,006 [15],[29],[30]   3,006 [15],[29],[30]   $ 3,075 [19],[26],[27]                
Investment, Identifier [Axis]: MRI Software LLC | First lien 5                          
Principal Amount or Par Value $ 781 [15],[16],[21],[32]   $ 781 [15],[16],[21],[32]   $ 785 [19],[20],[23],[28]                
Spread 4.75% [15],[16],[32]   4.75% [15],[16],[32]   4.75% [19],[20],[28] 4.75% [15],[16],[32] 4.75% [15],[16],[32] 4.75% [19],[20],[28] 4.75% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 785                    
Fair value, ending balance $ 767 [15],[16],[32]   767 [15],[16],[32]   $ 785 [19],[20],[28]                
Investment, Identifier [Axis]: Mai Capital Management Intermediate LLC | First lien - Drawn                          
Principal Amount or Par Value [15],[16],[21],[22],[32] $ 1,884   $ 1,884                    
Spread [15],[16],[22],[32] 4.75%   4.75%     4.75% 4.75%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22],[32] $ 1,884   $ 1,884                    
Investment, Identifier [Axis]: Mai Capital Management Intermediate LLC | First lien - Drawn 1                          
Principal Amount or Par Value [19],[20],[23],[24],[28]         $ 1,979                
Spread [19],[20],[24],[28]         4.75%     4.75% 4.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24],[28]     1,979                    
Fair value, ending balance [19],[20],[24],[28]         $ 1,979                
Investment, Identifier [Axis]: Mai Capital Management Intermediate LLC | First lien - Drawn 2                          
Principal Amount or Par Value [19],[20],[23],[24]         $ 57                
Spread [19],[20],[24]         4.75%     4.75% 4.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     57                    
Fair value, ending balance [19],[20],[24]         $ 57                
Investment, Identifier [Axis]: Mai Capital Management Intermediate LLC | First lien - Undrawn 1                          
Principal Amount or Par Value 1,099 [15],[16],[21],[22]   1,099 [15],[16],[21],[22]   1,709 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [19],[20],[24]                
Investment, Identifier [Axis]: Mai Capital Management Intermediate LLC | First lien - Undrawn 2                          
Principal Amount or Par Value 308 [15],[16],[21],[22]   308 [15],[16],[21],[22]   251 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [19],[20],[24]                
Investment, Identifier [Axis]: Matterhorn Finco, Inc., | First lien                          
Principal Amount or Par Value [15],[21],[29],[30],[38] $ 7,982   $ 7,982                    
Spread [15],[29],[30],[38] 5.50%   5.50%     5.50% 5.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[29],[30],[38] $ 7,943   $ 7,943                    
Investment, Identifier [Axis]: Matterhorn Finco, Inc., | First lien - Undrawn                          
Principal Amount or Par Value [15],[16],[21],[22],[38] 1,985   1,985                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22],[38] (10)   (10)                    
Investment, Identifier [Axis]: Meta Buyer LLC | First lien                          
Principal Amount or Par Value [23],[26],[27]         $ 2,987                
Spread [26],[27]         5.25%     5.25% 5.25%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [26],[27]     2,972                    
Fair value, ending balance [26],[27]         $ 2,972                
Investment, Identifier [Axis]: Meta Buyer LLC | First lien - Drawn 1                          
Principal Amount or Par Value [15],[16],[21],[22] $ 176   $ 176                    
Spread [15],[16],[22] 5.25%   5.25%     5.25% 5.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] $ 175   $ 175                    
Investment, Identifier [Axis]: Meta Buyer LLC | First lien - Drawn 2                          
Principal Amount or Par Value [15],[16],[21],[22] $ 124   $ 124                    
Spread [15],[16],[22] 5.25%   5.25%     5.25% 5.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] $ 123   $ 123                    
Investment, Identifier [Axis]: Meta Buyer LLC | First lien - Undrawn 1                          
Principal Amount or Par Value 412 [15],[16],[21],[22]   412 [15],[16],[21],[22]   819 [20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [20],[24]     0                    
Fair value, ending balance (2) [15],[16],[22]   (2) [15],[16],[22]   0 [20],[24]                
Investment, Identifier [Axis]: Meta Buyer LLC | First lien - Undrawn 2                          
Principal Amount or Par Value 642 [15],[16],[21],[22]   642 [15],[16],[21],[22]   409 [20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [20],[24]     0                    
Fair value, ending balance (3) [15],[16],[22]   (3) [15],[16],[22]   0 [20],[24]                
Investment, Identifier [Axis]: Meta Buyer LLC | First lien - Undrawn 3                          
Principal Amount or Par Value [20],[23],[24]         536                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [20],[24]     (2)                    
Fair value, ending balance [20],[24]         (2)                
Investment, Identifier [Axis]: Meta Buyer LLC | First lien 1                          
Principal Amount or Par Value [15],[21],[29],[30] $ 2,972   $ 2,972                    
Spread [15],[29],[30] 5.25%   5.25%     5.25% 5.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[29],[30] $ 2,957   $ 2,957                    
Investment, Identifier [Axis]: Meta Buyer LLC | First lien 2                          
Principal Amount or Par Value [15],[16],[21] $ 408   $ 408                    
Spread [15],[16] 5.25%   5.25%     5.25% 5.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16] $ 406   $ 406                    
Investment, Identifier [Axis]: Model N, Inc. | First lien                          
Principal Amount or Par Value [19],[23],[26],[27]         $ 43,774                
Spread [19],[26],[27]         4.75%     4.75% 4.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     43,774                    
Fair value, ending balance [19],[26],[27]         $ 43,774                
Investment, Identifier [Axis]: Model N, Inc. | First lien - Undrawn                          
Principal Amount or Par Value [15],[16],[21],[22] 4,825   4,825                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] (41)   (41)                    
Investment, Identifier [Axis]: Model N, Inc. | First lien - Undrawn 1                          
Principal Amount or Par Value [19],[20],[23],[24]         9,047                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance [19],[20],[24]         0                
Investment, Identifier [Axis]: Model N, Inc. | First lien - Undrawn 2                          
Principal Amount or Par Value [19],[20],[23],[24]         4,825                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance [19],[20],[24]         0                
Investment, Identifier [Axis]: Model N, Inc. | First lien 1                          
Principal Amount or Par Value [15],[21],[29],[30] $ 43,553   $ 43,553                    
Spread [15],[29],[30] 4.75%   4.75%     4.75% 4.75%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[29],[30] $ 43,187   $ 43,187                    
Investment, Identifier [Axis]: Model N, Inc. | First lien 2                          
Principal Amount or Par Value [15],[16],[21],[32] $ 4,512   $ 4,512                    
Spread [15],[16],[32] 4.75%   4.75%     4.75% 4.75%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[32] $ 4,474   $ 4,474                    
Investment, Identifier [Axis]: NC Topco, LLC | First lien                          
Principal Amount or Par Value [19],[23],[26],[27]         $ 5,862                
Spread [19],[26],[27]         4.50%     4.50% 4.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     5,862                    
Fair value, ending balance [19],[26],[27]         $ 5,862                
Investment, Identifier [Axis]: NC Topco, LLC | First lien - Undrawn 1                          
Principal Amount or Par Value [19],[20],[23],[24]         1,672                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance [19],[20],[24]         0                
Investment, Identifier [Axis]: NC Topco, LLC | First lien - Undrawn 2                          
Principal Amount or Par Value [19],[20],[23],[24]         669                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance [19],[20],[24]         0                
Investment, Identifier [Axis]: NC Topco, LLC | First lien 1                          
Principal Amount or Par Value [15],[21],[29],[30] $ 5,833   $ 5,833                    
Spread [15],[29],[30] 4.50%   4.50%     4.50% 4.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[29],[30] $ 5,775   $ 5,775                    
Investment, Identifier [Axis]: NC Topco, LLC | First lien 2                          
Principal Amount or Par Value [15],[16],[21],[32] $ 1,672   $ 1,672                    
Spread [15],[16],[32] 4.50%   4.50%     4.50% 4.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[32] $ 1,656   $ 1,656                    
Investment, Identifier [Axis]: NC Topco, LLC. | First lien - Undrawn                          
Principal Amount or Par Value [15],[16],[21],[22] 669   669                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] (7)   (7)                    
Investment, Identifier [Axis]: NHME Holdings Corp. | Ordinary shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [9],[19],[20],[60]     0                    
Fair value, ending balance [9],[19],[20],[60]         0                
Investment, Identifier [Axis]: NHME Holdings Corp. | Warrants                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [9],[19],[20],[60]     0                    
Fair value, ending balance [9],[19],[20],[60]         0                
Investment, Identifier [Axis]: NM GP Holdco, LLC                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance     390 322 322                
Gross additions     75 [10]   0 [11]                
Gross redemptions     (19) [12]   0 [13]                
Net Change In Unrealized Appreciation (Depreciation)     (28)   68                
Fair value, ending balance 418   418   390                
Net Realized Gains (Losses)     0   0                
Interest Income     0   0                
Dividend Income     22   44                
Other Income     0   0                
Investment, Identifier [Axis]: NM GP Holdco, LLC | Membership Interest                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [14],[15],[38],[61] 418   418                    
Investment, Identifier [Axis]: NM GP Holdco, LLC | Membership interest                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [9],[19],[39],[62]     390                    
Fair value, ending balance [9],[19],[39],[62]         390                
Investment, Identifier [Axis]: NM NL Holdings, L.P.                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance     106,096 104,512 104,512                
Gross additions     5,926 [10]   0 [11]                
Gross redemptions     (3,729) [12]   0 [13]                
Net Change In Unrealized Appreciation (Depreciation)     4,010   1,584                
Fair value, ending balance 112,303   112,303   106,096                
Net Realized Gains (Losses)     (2)   0                
Interest Income     0   0                
Dividend Income     4,400   8,740                
Other Income     99   0                
Investment, Identifier [Axis]: NM NL Holdings, L.P. | Membership Interest                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [14],[15],[38],[61] 112,303   112,303                    
Investment, Identifier [Axis]: NM NL Holdings, L.P. | Membership interest                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [9],[19],[39],[62]     106,096                    
Fair value, ending balance [9],[19],[39],[62]         106,096                
Investment, Identifier [Axis]: NM YI LLC                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance     8,641 9,960 9,960                
Gross additions     0 [10]   0 [11]                
Gross redemptions     0 [12]   0 [13]                
Net Change In Unrealized Appreciation (Depreciation)     46   (1,319)                
Fair value, ending balance 8,687   8,687   8,641                
Net Realized Gains (Losses)     0   0                
Interest Income     0   0                
Dividend Income     466   886                
Other Income     0   0                
Investment, Identifier [Axis]: NM YI, LLC | Membership Interest                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [14],[15],[61] 8,687   8,687                    
Investment, Identifier [Axis]: NM YI, LLC | Membership interest                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [9],[19],[62]     8,641                    
Fair value, ending balance [9],[19],[62]         8,641                
Investment, Identifier [Axis]: NMFC Senior Loan Program III LLC                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance     160,000 160,000 160,000                
Gross additions     0 [10]   0 [11]                
Gross redemptions     0 [12]   0 [13]                
Net Change In Unrealized Appreciation (Depreciation)     (2,128)   0                
Fair value, ending balance 157,872   157,872   160,000                
Net Realized Gains (Losses)     0   0                
Interest Income     0   0                
Dividend Income     10,560   22,600                
Other Income     0   0                
Investment, Identifier [Axis]: NMFC Senior Loan Program III LLC | Membership Interest                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [14],[15],[16],[38] 157,872   157,872                    
Investment, Identifier [Axis]: NMFC Senior Loan Program III LLC | Membership interest                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [9],[19],[20],[39]     160,000                    
Fair value, ending balance [9],[19],[20],[39]         160,000                
Investment, Identifier [Axis]: NMFC Senior Loan Program IV LLC                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance     112,400 112,400 112,400                
Gross additions     0 [10]   0 [11]                
Gross redemptions     0 [12]   0 [13]                
Net Change In Unrealized Appreciation (Depreciation)     (6,868)   0                
Fair value, ending balance 105,532   105,532   112,400                
Net Realized Gains (Losses)     0   0                
Interest Income     0   0                
Dividend Income     7,166   15,315                
Other Income     0   0                
Investment, Identifier [Axis]: NMFC Senior Loan Program IV LLC | Membership Interest                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [14],[15],[16],[38] 105,532   105,532                    
Investment, Identifier [Axis]: NMFC Senior Loan Program IV LLC | Membership interest                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [9],[19],[20],[39]     112,400                    
Fair value, ending balance [9],[19],[20],[39]         112,400                
Investment, Identifier [Axis]: National HME, Inc. | Second lien                          
Principal Amount or Par Value [9],[19],[20],[23],[60]         8,281                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [9],[19],[20],[60]     0                    
Fair value, ending balance [9],[19],[20],[60]         $ 0                
Investment, Identifier [Axis]: National HME, Inc., Second lien, Tranche A Term Loan                          
Investment, percentage of interest entitled to receive         20.00%     20.00% 20.00%        
Spread         5.00%     5.00% 5.00%        
Investment, Identifier [Axis]: National HME, Inc., Second lien, Tranche B Term Loan                          
Investment, percentage of interest entitled to receive         20.00%     20.00% 20.00%        
Spread         6.00%     6.00% 6.00%        
Investment, Identifier [Axis]: National HME, Inc./NHME Holdings Corp.                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance     0 3,000 $ 3,000                
Gross additions     0 [10]   0 [11]                
Gross redemptions     (12,872) [12]   0 [13]                
Net Change In Unrealized Appreciation (Depreciation)     12,872   (3,000)                
Fair value, ending balance 0   0   0                
Net Realized Gains (Losses)     (12,872)   0                
Interest Income     0   0                
Dividend Income     0   0                
Other Income     0   0                
Investment, Identifier [Axis]: Nelipak Holding Company | First lien - Drawn 1                          
Principal Amount or Par Value [19],[20],[23],[24],[28]         $ 2,168                
Spread [19],[20],[24],[28]         5.50%     5.50% 5.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24],[28]     2,168                    
Fair value, ending balance [19],[20],[24],[28]         $ 2,168                
Investment, Identifier [Axis]: Nelipak Holding Company | First lien - Drawn 2                          
Principal Amount or Par Value [19],[20],[23],[24],[28],[63]         $ 392                
Spread [19],[20],[24],[28],[63]         5.50%     5.50% 5.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24],[28],[63]     392                    
Fair value, ending balance [19],[20],[24],[28],[63]         $ 392                
Investment, Identifier [Axis]: Nelipak Holding Company | First lien - Drawn 3                          
Principal Amount or Par Value         $ 123     € 105 [19],[20],[23],[24]          
Spread [19],[20],[24]         5.50%     5.50% 5.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     123                    
Fair value, ending balance [19],[20],[24]         $ 123                
Investment, Identifier [Axis]: Nelipak Holding Company | First lien - Undrawn 1                          
Principal Amount or Par Value 1,332 [15],[16],[21],[22]   1,332 [15],[16],[21],[22]   1,332 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [19],[20],[24]                
Investment, Identifier [Axis]: Nelipak Holding Company | First lien - Undrawn 2                          
Principal Amount or Par Value 7,322   7,322   7,529 € 6,411 [15],[16],[21],[22],[32],[64]   € 6,411 [19],[20],[23],[24],[28],[63]          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24],[28],[63]     0                    
Fair value, ending balance 0 [15],[16],[22],[32],[64]   0 [15],[16],[22],[32],[64]   0 [19],[20],[24],[28],[63]                
Investment, Identifier [Axis]: Nelipak Holding Company | First lien - Undrawn 3                          
Principal Amount or Par Value 1,366   1,366   1,282 1,196 [15],[16],[21],[22],[32],[64]   1,092 [19],[20],[23],[24],[28],[63]          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24],[28],[63]     0                    
Fair value, ending balance 0 [15],[16],[22],[32],[64]   0 [15],[16],[22],[32],[64]   0 [19],[20],[24],[28],[63]                
Investment, Identifier [Axis]: Nelipak Holding Company | First lien - Undrawn 4                          
Principal Amount or Par Value 2,613 [15],[16],[21],[22]   2,613 [15],[16],[21],[22]   2,221 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [19],[20],[24]                
Investment, Identifier [Axis]: Nelipak Holding Company | First lien 1                          
Principal Amount or Par Value $ 18,589   $ 18,589   $ 19,212 € 16,275 [15],[16],[21],[32],[64]   € 16,357 [19],[20],[23],[28],[63]          
Spread 5.50% [15],[16],[32],[64]   5.50% [15],[16],[32],[64]   5.50% [19],[20],[28],[63] 5.50% [15],[16],[32],[64] 5.50% [15],[16],[32],[64] 5.50% [19],[20],[28],[63] 5.50% [19],[20],[28],[63]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28],[63]     $ 19,214                    
Fair value, ending balance $ 18,591 [15],[16],[32],[64]   18,591 [15],[16],[32],[64]   $ 19,214 [19],[20],[28],[63]                
Investment, Identifier [Axis]: Nelipak Holding Company | First lien 2                          
Principal Amount or Par Value $ 8,887 [15],[21],[29],[30]   $ 8,887 [15],[21],[29],[30]   $ 8,932 [19],[23],[26],[27]                
Spread 5.50% [15],[29],[30]   5.50% [15],[29],[30]   5.50% [19],[26],[27] 5.50% [15],[29],[30] 5.50% [15],[29],[30] 5.50% [19],[26],[27] 5.50% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 8,932                    
Fair value, ending balance $ 8,887 [15],[29],[30]   8,887 [15],[29],[30]   $ 8,932 [19],[26],[27]                
Investment, Identifier [Axis]: Nelipak Holding Company | First lien 3                          
Principal Amount or Par Value [15],[16],[21],[32] $ 2,157   $ 2,157                    
Spread [15],[16],[32] 5.50%   5.50%     5.50% 5.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[32] $ 2,157   $ 2,157                    
Investment, Identifier [Axis]: New ACI Buyer LLC | First lien 1                          
Principal Amount or Par Value [21],[30] $ 3,572   $ 3,572                    
Spread [30],[35] 3.13%   3.13%     3.13% 3.13%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [30] $ 3,572   $ 3,572                    
Investment, Identifier [Axis]: New ACI Buyer LLC | First lien 2                          
Principal Amount or Par Value [21],[29],[30] $ 1,841   $ 1,841                    
Spread [29],[30] 5.50%   5.50%     5.50% 5.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [29],[30] $ 1,841   $ 1,841                    
Investment, Identifier [Axis]: New ACI Buyer LLC | First lien 3                          
Principal Amount or Par Value [16],[21],[32] $ 1,686   $ 1,686                    
Spread [16],[32],[35] 3.13%   3.13%     3.13% 3.13%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [16],[32] $ 1,686   $ 1,686                    
Investment, Identifier [Axis]: New ACI Buyer LLC | Subordinated 1                          
Principal Amount or Par Value [21],[30] 3,175   3,175                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [30] 3,175   3,175                    
Investment, Identifier [Axis]: New ACI Buyer LLC | Subordinated 2                          
Principal Amount or Par Value [16],[21],[32] 1,499   1,499                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [16],[32] $ 1,499   $ 1,499                    
Investment, Identifier [Axis]: New ACI Buyer, LLC | First lien                          
Number of investments held | investment 2   2     2 2            
Investment, Identifier [Axis]: New ACI Holdings LLC | Class A Common Units 1                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [30] $ 7,587   $ 7,587                    
Investment, Identifier [Axis]: New ACI Holdings LLC | Class A Common Units 2                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [16] 3,582   3,582                    
Investment, Identifier [Axis]: New ACI Holdings LLC | Class B Common Units                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [16] $ 630   $ 630                    
Investment, Identifier [Axis]: New ACI Intermediate II, LLC | Subordinated                          
Number of investments held | investment 1   1     1 1            
Investment, Identifier [Axis]: New Benevis Holdco, Inc. | First lien                          
Principal Amount or Par Value [14],[15],[21],[30] $ 25,643   $ 25,643                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [14],[15],[30] 25,643   25,643                    
Investment, Identifier [Axis]: New Benevis Holdco, Inc. | First lien 1                          
Principal Amount or Par Value [9],[19],[23],[27]         51,933                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [9],[19],[27]     51,933                    
Fair value, ending balance [9],[19],[27]         51,933                
Investment, Identifier [Axis]: New Benevis Holdco, Inc. | First lien 2                          
Principal Amount or Par Value [9],[19],[20],[23],[28]         45,204                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [9],[19],[20],[28]     45,204                    
Fair value, ending balance [9],[19],[20],[28]         45,204                
Investment, Identifier [Axis]: New Benevis Holdco, Inc. | Subordinated                          
Principal Amount or Par Value 28,541 [14],[15],[16],[21]   28,541 [14],[15],[16],[21]   26,878 [9],[19],[20],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [9],[19],[20]     26,878                    
Fair value, ending balance 28,541 [14],[15],[16]   28,541 [14],[15],[16]   26,878 [9],[19],[20]                
Investment, Identifier [Axis]: New Benevis Topco, LLC / New Benevis Holdco, Inc.                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance     154,464 140,102 140,102                
Gross additions     7,255 [10]   21,456 [11]                
Gross redemptions     (76,831) [12]   0 [13]                
Net Change In Unrealized Appreciation (Depreciation)     5,199   (7,094)                
Fair value, ending balance 90,087   90,087   154,464                
Net Realized Gains (Losses)     (5,717)   0                
Interest Income     5,147   14,309                
Dividend Income     0   0                
Other Income     0   1,383                
Investment, Identifier [Axis]: New Benevis Topco, LLC | Common Stock 1                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [14],[15],[30] 24,446   24,446                    
Investment, Identifier [Axis]: New Benevis Topco, LLC | Common Stock 2                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [14],[15],[16] 11,457   11,457                    
Investment, Identifier [Axis]: New Benevis Topco, LLC | Common stock 1                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [9],[19],[27]     20,733                    
Fair value, ending balance [9],[19],[27]         20,733                
Investment, Identifier [Axis]: New Benevis Topco, LLC | Common stock 2                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [9],[19],[20]     9,716                    
Fair value, ending balance [9],[19],[20]         9,716                
Investment, Identifier [Axis]: New Permian Holdco, Inc. / New Permian Holdco, L.L.C.                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance     63,833 63,076 63,076                
Gross additions     2,982 [10]   7,657 [11]                
Gross redemptions     0 [12]   0 [13]                
Net Change In Unrealized Appreciation (Depreciation)     (1,000)   (6,900)                
Fair value, ending balance 65,815   65,815   63,833                
Net Realized Gains (Losses)     0   0                
Interest Income     2,983   5,759                
Dividend Income     0   0                
Other Income     250   500                
Investment, Identifier [Axis]: New Permian Holdco, Inc. | Ordinary Shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [14],[15],[16] 11,000   11,000                    
Investment, Identifier [Axis]: New Permian Holdco, Inc. | Ordinary shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [9],[19],[20]     12,000                    
Fair value, ending balance [9],[19],[20]         12,000                
Investment, Identifier [Axis]: New Permian Holdco, L.L.C. | First lien                          
Principal Amount or Par Value $ 23,336 [14],[15],[16],[21],[32]   $ 23,336 [14],[15],[16],[21],[32]   $ 23,336 [9],[19],[20],[23],[28]                
Spread 9.00% [14],[15],[16],[32]   9.00% [14],[15],[16],[32]   9.00% [9],[19],[20],[28] 9.00% [14],[15],[16],[32] 9.00% [14],[15],[16],[32] 9.00% [9],[19],[20],[28] 9.00% [9],[19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [9],[19],[20],[28]     $ 23,336                    
Fair value, ending balance $ 23,336 [14],[15],[16],[32]   23,336 [14],[15],[16],[32]   $ 23,336 [9],[19],[20],[28]                
Investment, Identifier [Axis]: New Permian Holdco, L.L.C. | First lien - Drawn                          
Principal Amount or Par Value $ 31,479 [14],[15],[16],[21],[22],[32]   $ 31,479 [14],[15],[16],[21],[22],[32]   $ 28,497 [9],[19],[20],[23],[24],[28]                
Spread 6.00% [14],[15],[16],[22],[32]   6.00% [14],[15],[16],[22],[32]   6.00% [9],[19],[20],[24],[28] 6.00% [14],[15],[16],[22],[32] 6.00% [14],[15],[16],[22],[32] 6.00% [9],[19],[20],[24],[28] 6.00% [9],[19],[20],[24],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [9],[19],[20],[24],[28]     $ 28,497                    
Fair value, ending balance $ 31,479 [14],[15],[16],[22],[32]   31,479 [14],[15],[16],[22],[32]   $ 28,497 [9],[19],[20],[24],[28]                
Investment, Identifier [Axis]: New Permian Holdco, L.L.C. | First lien - Undrawn                          
Principal Amount or Par Value 415 [14],[15],[16],[21],[22]   415 [14],[15],[16],[21],[22]   3,397 [9],[19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [9],[19],[20],[24]     0                    
Fair value, ending balance 0 [14],[15],[16],[22]   0 [14],[15],[16],[22]   0 [9],[19],[20],[24]                
Investment, Identifier [Axis]: Next Holdco, LLC | First lien                          
Principal Amount or Par Value $ 6,232 [15],[21],[29],[30]   $ 6,232 [15],[21],[29],[30]   $ 6,264 [19],[23],[26],[27]                
Spread 5.25% [15],[29],[30]   5.25% [15],[29],[30]   5.25% [19],[26],[27] 5.25% [15],[29],[30] 5.25% [15],[29],[30] 5.25% [19],[26],[27] 5.25% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 6,264                    
Fair value, ending balance $ 6,232 [15],[29],[30]   6,232 [15],[29],[30]   $ 6,264 [19],[26],[27]                
Investment, Identifier [Axis]: Next Holdco, LLC | First lien - Undrawn                          
Principal Amount or Par Value 339 [15],[16],[21],[22]   339 [15],[16],[21],[22]   339 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [19],[20],[24]                
Investment, Identifier [Axis]: Notorious Buyer, LLC | Common Stock                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[65] 5,686   5,686                    
Investment, Identifier [Axis]: Notorious Buyer, LLC | Common stock                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[66]     7,339                    
Fair value, ending balance [19],[20],[66]         7,339                
Investment, Identifier [Axis]: Notorious Topco, LLC | First lien                          
Principal Amount or Par Value [19],[20],[23]         4,692                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20]     4,692                    
Fair value, ending balance [19],[20]         4,692                
Investment, Identifier [Axis]: Notorious Topco, LLC | First lien - Undrawn                          
Principal Amount or Par Value 938 [15],[16],[21],[22],[65]   938 [15],[16],[21],[22],[65]   938 [19],[20],[23],[24],[66]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24],[66]     0                    
Fair value, ending balance 0 [15],[16],[22],[65]   0 [15],[16],[22],[65]   0 [19],[20],[24],[66]                
Investment, Identifier [Axis]: Notorious Topco, LLC | Subordinated                          
Principal Amount or Par Value [19],[20],[23]         2,252                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20]     2,252                    
Fair value, ending balance [19],[20]         2,252                
Investment, Identifier [Axis]: OEConnection LLC | First lien                          
Principal Amount or Par Value $ 6,609 [15],[21],[29],[30]   $ 6,609 [15],[21],[29],[30]   $ 6,609 [23],[26],[27]                
Spread 4.50% [15],[29],[30]   4.50% [15],[29],[30]   4.50% [26],[27] 4.50% [15],[29],[30] 4.50% [15],[29],[30] 4.50% [26],[27] 4.50% [26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [26],[27]     $ 6,620                    
Fair value, ending balance $ 6,519 [15],[29],[30]   6,519 [15],[29],[30]   $ 6,620 [26],[27]                
Investment, Identifier [Axis]: OEConnection LLC | First lien - Undrawn 1                          
Principal Amount or Par Value 495 [15],[16],[21],[22]   495 [15],[16],[21],[22]   495 [20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [20],[24]     1                    
Fair value, ending balance (7) [15],[16],[22]   (7) [15],[16],[22]   1 [20],[24]                
Investment, Identifier [Axis]: OEConnection LLC | First lien - Undrawn 2                          
Principal Amount or Par Value 618 [15],[16],[21],[22]   618 [15],[16],[21],[22]   618 [20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [20],[24]     0                    
Fair value, ending balance (8) [15],[16],[22]   (8) [15],[16],[22]   0 [20],[24]                
Investment, Identifier [Axis]: PDI TA Holdings, Inc. | First lien - Drawn                          
Principal Amount or Par Value [19],[20],[23],[24]         $ 1,342                
Spread [19],[20],[24]         5.50%     5.50% 5.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     1,342                    
Fair value, ending balance [19],[20],[24]         $ 1,342                
Investment, Identifier [Axis]: PDI TA Holdings, Inc. | First lien - Undrawn                          
Principal Amount or Par Value [19],[20],[23],[24]         488                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance [19],[20],[24]         0                
Investment, Identifier [Axis]: PDI TA Holdings, Inc. | First lien 1                          
Principal Amount or Par Value $ 22,197 [15],[21],[25]   $ 22,197 [15],[21],[25]   $ 22,171 [19],[23],[31]                
Spread 2.50% [15],[25],[35]   2.50% [15],[25],[35]   5.50% [19],[31] 2.50% [15],[25],[35] 2.50% [15],[25],[35] 5.50% [19],[31] 5.50% [19],[31]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[31]     $ 22,171                    
Fair value, ending balance $ 21,198 [15],[25]   21,198 [15],[25]   $ 22,171 [19],[31]                
Investment, Identifier [Axis]: PDI TA Holdings, Inc. | First lien 2                          
Principal Amount or Par Value $ 1,830 [15],[16],[21]   $ 1,830 [15],[16],[21]   $ 509 [19],[20],[23],[28]                
Spread 5.50% [15],[16]   5.50% [15],[16]   5.50% [19],[20],[28] 5.50% [15],[16] 5.50% [15],[16] 5.50% [19],[20],[28] 5.50% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 509                    
Fair value, ending balance $ 1,748 [15],[16]   1,748 [15],[16]   $ 509 [19],[20],[28]                
Investment, Identifier [Axis]: PDI TA Holdings, Inc. | First lien 3                          
Principal Amount or Par Value [15],[16],[21],[32] $ 510   $ 510                    
Spread [15],[16],[32],[35] 2.50%   2.50%     2.50% 2.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[32] $ 487   $ 487                    
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC | First lien - Drawn                          
Principal Amount or Par Value $ 170 [15],[16],[21],[22],[32]   $ 170 [15],[16],[21],[22],[32]   $ 61 [19],[20],[23],[24],[28]                
Spread 5.75% [15],[16],[22],[32]   5.75% [15],[16],[22],[32]   5.75% [19],[20],[24],[28] 5.75% [15],[16],[22],[32] 5.75% [15],[16],[22],[32] 5.75% [19],[20],[24],[28] 5.75% [19],[20],[24],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24],[28]     $ 61                    
Fair value, ending balance $ 167 [15],[16],[22],[32]   167 [15],[16],[22],[32]   $ 61 [19],[20],[24],[28]                
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC | First lien - Undrawn                          
Principal Amount or Par Value [19],[20],[23],[24]         426                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance [19],[20],[24]         0                
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC | First lien 1                          
Principal Amount or Par Value $ 22,050 [15],[21],[25]   $ 22,050 [15],[21],[25]   $ 22,163 [19],[23],[31]                
Spread 5.75% [15],[25]   5.75% [15],[25]   5.75% [19],[31] 5.75% [15],[25] 5.75% [15],[25] 5.75% [19],[31] 5.75% [19],[31]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[31]     $ 22,163                    
Fair value, ending balance $ 21,638 [15],[25]   21,638 [15],[25]   $ 22,163 [19],[31]                
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC | First lien 2                          
Principal Amount or Par Value $ 8,134 [15],[21],[29],[30]   $ 8,134 [15],[21],[29],[30]   $ 8,175 [19],[23],[26],[27]                
Spread 5.75% [15],[29],[30]   5.75% [15],[29],[30]   5.75% [19],[26],[27] 5.75% [15],[29],[30] 5.75% [15],[29],[30] 5.75% [19],[26],[27] 5.75% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 8,175                    
Fair value, ending balance $ 7,982 [15],[29],[30]   7,982 [15],[29],[30]   $ 8,175 [19],[26],[27]                
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC. | First lien - Undrawn                          
Principal Amount or Par Value [15],[16],[21],[22] 316   316                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] (6)   (6)                    
Investment, Identifier [Axis]: PPVA Black Elk (Equity) LLC | Claim                          
Principal Amount or Par Value [15],[16],[21] 14,500   14,500                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16] 2,755   2,755                    
Investment, Identifier [Axis]: PPVA Black Elk (Equity) LLC | Subordinated                          
Principal Amount or Par Value [19],[20],[23]         14,500                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20]     6,525                    
Fair value, ending balance 2,755   2,755   6,525 [19],[20]                
Investment, Identifier [Axis]: PPVA Black Elk (Equity) LLC, Subordinated                          
Principal Amount or Par Value                         $ 20,000
Investment, Identifier [Axis]: PPVA Fund, L.P. | Claim                          
Principal Amount or Par Value [21],[67] 0   0                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [67] 0   0                    
Investment, Identifier [Axis]: PPVA Fund, L.P. | Collateralized Financing                          
Principal Amount or Par Value [23],[37],[68]         0                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [37],[68]     0                    
Fair value, ending balance [37],[68]         0                
Investment, Identifier [Axis]: Permian Trust | First lien                          
Principal Amount or Par Value 3,409 [8],[15],[16],[21]   3,409 [8],[15],[16],[21]   3,409 [3],[19],[20],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [3],[19],[20]     0                    
Fair value, ending balance 0 [8],[15],[16]   0 [8],[15],[16]   0 [3],[19],[20]                
Investment, Identifier [Axis]: Permian Trust | Trust Claim                          
Principal Amount or Par Value 247 [8],[15],[21],[69]   247 [8],[15],[21],[69]   247 [3],[19],[23],[70]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [3],[19],[70]     0                    
Fair value, ending balance 0 [8],[15],[69]   0 [8],[15],[69]   0 [3],[19],[70]                
Investment, Identifier [Axis]: PetVet Care Centers, LLC | First lien                          
Principal Amount or Par Value $ 27,719 [15],[21],[29],[30]   $ 27,719 [15],[21],[29],[30]   $ 27,861 [19],[23],[26],[27]                
Spread 6.00% [15],[29],[30]   6.00% [15],[29],[30]   6.00% [19],[26],[27] 6.00% [15],[29],[30] 6.00% [15],[29],[30] 6.00% [19],[26],[27] 6.00% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 26,649                    
Fair value, ending balance $ 23,849 [15],[29],[30]   23,849 [15],[29],[30]   $ 26,649 [19],[26],[27]                
Investment, Identifier [Axis]: PetVet Care Centers, LLC | First lien - Drawn                          
Principal Amount or Par Value $ 1,112 [15],[16],[21],[22],[32]   $ 1,112 [15],[16],[21],[22],[32]   $ 371 [19],[20],[23],[24],[28]                
Spread 6.00% [15],[16],[22],[32]   6.00% [15],[16],[22],[32]   6.00% [19],[20],[24],[28] 6.00% [15],[16],[22],[32] 6.00% [15],[16],[22],[32] 6.00% [19],[20],[24],[28] 6.00% [19],[20],[24],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24],[28]     $ 355                    
Fair value, ending balance $ 957 [15],[16],[22],[32]   957 [15],[16],[22],[32]   $ 355 [19],[20],[24],[28]                
Investment, Identifier [Axis]: PetVet Care Centers, LLC | First lien - Undrawn                          
Principal Amount or Par Value 2,596 [15],[16],[21],[22]   2,596 [15],[16],[21],[22]   3,337 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     (145)                    
Fair value, ending balance (362) [15],[16],[22]   (362) [15],[16],[22]   (145) [19],[20],[24]                
Investment, Identifier [Axis]: Pioneer Topco I, L.P. | Class A-2 Common Units                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[71] 1,600   1,600                    
Investment, Identifier [Axis]: Pioneer Topco I, L.P. | Class A-2 common units                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[72]     2,200                    
Fair value, ending balance [19],[72]         2,200                
Investment, Identifier [Axis]: Planview Parent, Inc. | First lien                          
Principal Amount or Par Value [16],[21],[32] $ 3,755   $ 3,755                    
Spread [16],[32] 3.50%   3.50%     3.50% 3.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [16],[32] $ 3,247   $ 3,247                    
Investment, Identifier [Axis]: Planview Parent, Inc. | Second lien                          
Principal Amount or Par Value $ 9,231 [15],[16],[21],[32]   $ 9,231 [15],[16],[21],[32]   $ 9,231 [19],[20],[23],[28]                
Spread 5.75% [15],[16],[32]   5.75% [15],[16],[32]   5.75% [19],[20],[28] 5.75% [15],[16],[32] 5.75% [15],[16],[32] 5.75% [19],[20],[28] 5.75% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 8,827                    
Fair value, ending balance $ 6,811 [15],[16],[32]   6,811 [15],[16],[32]   $ 8,827 [19],[20],[28]                
Investment, Identifier [Axis]: Power Grid Holdings, Inc. | First lien                          
Principal Amount or Par Value [19],[23],[31]         $ 15,597                
Spread [19],[31]         4.75%     4.75% 4.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[31]     15,597                    
Fair value, ending balance [19],[31]         $ 15,597                
Investment, Identifier [Axis]: Power Grid Holdings, Inc. | First lien - Drawn                          
Principal Amount or Par Value [19],[20],[23],[24]         $ 429                
Spread [19],[20],[24]         3.75%     3.75% 3.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     429                    
Fair value, ending balance [19],[20],[24]         $ 429                
Investment, Identifier [Axis]: Power Grid Holdings, Inc. | First lien - Undrawn                          
Principal Amount or Par Value [19],[20],[23],[24]         3,861                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance [19],[20],[24]         0                
Investment, Identifier [Axis]: Project Accelerate Parent, LLC | First lien                          
Principal Amount or Par Value $ 10,360 [15],[21],[40]   $ 10,360 [15],[21],[40]   $ 10,413 [19],[23],[41]                
Spread 5.25% [15],[40]   5.25% [15],[40]   5.25% [19],[41] 5.25% [15],[40] 5.25% [15],[40] 5.25% [19],[41] 5.25% [19],[41]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[41]     $ 10,413                    
Fair value, ending balance $ 10,360 [15],[40]   10,360 [15],[40]   $ 10,413 [19],[41]                
Investment, Identifier [Axis]: Project Accelerate Parent, LLC | First lien - Undrawn                          
Principal Amount or Par Value 1,510 [15],[16],[21],[22]   1,510 [15],[16],[21],[22]   1,510 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [19],[20],[24]                
Investment, Identifier [Axis]: RLG Holdings, LLC | First lien 1                          
Principal Amount or Par Value $ 18,577 [15],[16],[21],[32]   $ 18,577 [15],[16],[21],[32]   $ 7,184 [23],[26],[27]                
Spread 4.25% [15],[16],[32]   4.25% [15],[16],[32]   4.25% [26],[27] 4.25% [15],[16],[32] 4.25% [15],[16],[32] 4.25% [26],[27] 4.25% [26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [26],[27]     $ 4,419                    
Fair value, ending balance $ 10,693 [15],[16],[32]   10,693 [15],[16],[32]   $ 4,419 [26],[27]                
Investment, Identifier [Axis]: RLG Holdings, LLC | First lien 2                          
Principal Amount or Par Value $ 7,147 [15],[21],[29],[30]   $ 7,147 [15],[21],[29],[30]   $ 4,163 [23],[26],[27]                
Spread 4.25% [15],[29],[30]   4.25% [15],[29],[30]   5.00% [26],[27] 4.25% [15],[29],[30] 4.25% [15],[29],[30] 5.00% [26],[27] 5.00% [26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [26],[27]     $ 2,613                    
Fair value, ending balance $ 4,114 [15],[29],[30]   4,114 [15],[29],[30]   $ 2,613 [26],[27]                
Investment, Identifier [Axis]: RLG Holdings, LLC | First lien 3                          
Principal Amount or Par Value [15],[21],[29],[30] $ 4,142   $ 4,142                    
Spread [15],[29],[30] 5.00%   5.00%     5.00% 5.00%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[29],[30] $ 2,384   $ 2,384                    
Investment, Identifier [Axis]: RLG Holdings, LLC | First lien 4                          
Principal Amount or Par Value [15],[16],[21],[32] $ 1,191   $ 1,191                    
Spread [15],[16],[32] 5.00%   5.00%     5.00% 5.00%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[32] $ 685   $ 685                    
Investment, Identifier [Axis]: RLG Holdings, LLC | Second lien                          
Principal Amount or Par Value [15],[16],[21],[32] $ 10,768   $ 10,768                    
Spread [15],[16],[32] 7.50%   7.50%     7.50% 7.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[32] $ 3,001   $ 3,001                    
Investment, Identifier [Axis]: RailPros Parent, LLC | First lien                          
Principal Amount or Par Value $ 5,799 [15],[21],[29],[30]   $ 5,799 [15],[21],[29],[30]   $ 5,828 [19],[23],[26],[27]                
Spread 4.25% [15],[29],[30]   4.25% [15],[29],[30]   4.25% [19],[26],[27] 4.25% [15],[29],[30] 4.25% [15],[29],[30] 4.25% [19],[26],[27] 4.25% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 5,799                    
Fair value, ending balance $ 5,799 [15],[29],[30]   5,799 [15],[29],[30]   $ 5,799 [19],[26],[27]                
Investment, Identifier [Axis]: RailPros Parent, LLC | First lien - Drawn                          
Principal Amount or Par Value [15],[16],[21],[22] $ 538   $ 538                    
Spread [15],[16],[22] 4.25%   4.25%     4.25% 4.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] $ 538   $ 538                    
Investment, Identifier [Axis]: RailPros Parent, LLC | First lien - Undrawn 1                          
Principal Amount or Par Value 1,258 [15],[16],[21],[22]   1,258 [15],[16],[21],[22]   899 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     (4)                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   (4) [19],[20],[24]                
Investment, Identifier [Axis]: RailPros Parent, LLC | First lien - Undrawn 2                          
Principal Amount or Par Value 899 [15],[16],[21],[22]   899 [15],[16],[21],[22]   1,798 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     (9)                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   (9) [19],[20],[24]                
Investment, Identifier [Axis]: RealPage, Inc. | First lien                          
Principal Amount or Par Value [21],[29],[30] $ 1,958   $ 1,958                    
Spread [29],[30] 3.75%   3.75%     3.75% 3.75%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [29],[30] $ 1,846   $ 1,846                    
Investment, Identifier [Axis]: Reorganized Careismatic Brands, LLC | Trust Claim 1                          
Principal Amount or Par Value 152 [15],[21],[30]   152 [15],[21],[30]   152 [19],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[27]     152                    
Fair value, ending balance 152 [15],[30]   152 [15],[30]   152 [19],[27]                
Investment, Identifier [Axis]: Reorganized Careismatic Brands, LLC | Trust Claim 2                          
Principal Amount or Par Value 52 [15],[16],[21]   52 [15],[16],[21]   52 [19],[20],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20]     52                    
Fair value, ending balance 52 [15],[16]   52 [15],[16]   52 [19],[20]                
Investment, Identifier [Axis]: Reorganized Careismatic Brands, LLC | Warrants 1                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[27]     272                    
Fair value, ending balance 272 [15],[30]   272 [15],[30]   272 [19],[27]                
Investment, Identifier [Axis]: Reorganized Careismatic Brands, LLC | Warrants 2                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20]     93                    
Fair value, ending balance 93 [15],[16]   93 [15],[16]   93 [19],[20]                
Investment, Identifier [Axis]: Riskonnect Parent, LLC | First lien - Undrawn                          
Principal Amount or Par Value [19],[20],[23],[24]         6,349                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance [19],[20],[24]         0                
Investment, Identifier [Axis]: Sierra Enterprises, LLC | First lien                          
Principal Amount or Par Value $ 21,250 [15],[21],[29],[30]   $ 21,250 [15],[21],[29],[30]   $ 21,357 [19],[23],[26],[27]                
Spread 5.75% [15],[29],[30]   5.75% [15],[29],[30]   6.00% [19],[26],[27] 5.75% [15],[29],[30] 5.75% [15],[29],[30] 6.00% [19],[26],[27] 6.00% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 21,197                    
Fair value, ending balance $ 21,250 [15],[29],[30]   21,250 [15],[29],[30]   $ 21,197 [19],[26],[27]                
Investment, Identifier [Axis]: Sierra Enterprises, LLC | First lien - Undrawn                          
Principal Amount or Par Value 2,717 [15],[16],[21],[22]   2,717 [15],[16],[21],[22]   2,717 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     (20)                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   (20) [19],[20],[24]                
Investment, Identifier [Axis]: Sierra Hamilton Holdings Corporation                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance     2,000 2,000 2,000                
Gross additions     0 [4]   0 [5]                
Gross redemptions     0 [6]   0 [7]                
Net Change In Unrealized Appreciation (Depreciation)     0   0                
Fair value, ending balance 2,000   2,000   2,000                
Net Realized Gains (Losses)     0   0                
Interest Income     0   0                
Dividend Income     0   0                
Other Income     0   0                
Investment, Identifier [Axis]: Sierra Hamilton Holdings Corporation | Ordinary Shares 1                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [8],[15],[30] 1,800   1,800                    
Investment, Identifier [Axis]: Sierra Hamilton Holdings Corporation | Ordinary Shares 2                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [8],[15],[16] 201   201                    
Investment, Identifier [Axis]: Sierra Hamilton Holdings Corporation | Ordinary shares 1                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [3],[19],[27]     1,799                    
Fair value, ending balance [3],[19],[27]         1,799                
Investment, Identifier [Axis]: Sierra Hamilton Holdings Corporation | Ordinary shares 2                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [3],[19],[20]     201                    
Fair value, ending balance [3],[19],[20]         201                
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc. | Series A Preferred Shares 1                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[25] 13,922   13,922                    
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc. | Series A Preferred Shares 2                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[32] 64   64                    
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc. | Series A preferred shares                          
Principal Amount or Par Value 19,839   19,839   25,639                
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc. | Series A preferred shares 1                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[31]     18,204                    
Fair value, ending balance [19],[31]         18,204                
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc. | Series A preferred shares 2                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     6,276                    
Fair value, ending balance [19],[20],[28]         $ 6,276                
Investment, Identifier [Axis]: TMK Hawk Parent, Corp. | First lien                          
Number of investments held | investment         2     2 2        
Investment, Identifier [Axis]: TMK Hawk Parent, Corp. | First lien - Undrawn                          
Principal Amount or Par Value 2,695 [15],[16],[21],[22],[73]   2,695 [15],[16],[21],[22],[73]   $ 2,695 [19],[20],[23],[24],[74]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24],[74]     0                    
Fair value, ending balance 0 [15],[16],[22],[73]   0 [15],[16],[22],[73]   0 [19],[20],[24],[74]                
Investment, Identifier [Axis]: TMK Hawk Parent, Corp. | First lien 1                          
Principal Amount or Par Value $ 27,414 [15],[16],[21],[32]   $ 27,414 [15],[16],[21],[32]   $ 22,939 [19],[20],[23],[28]                
Spread 4.00% [15],[16],[32]   4.00% [15],[16],[32]   2.00% [19],[20],[28],[34] 4.00% [15],[16],[32] 4.00% [15],[16],[32] 2.00% [19],[20],[28],[34] 2.00% [19],[20],[28],[34]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 14,820                    
Fair value, ending balance $ 17,711 [15],[16],[32]   17,711 [15],[16],[32]   $ 14,820 [19],[20],[28]                
Investment, Identifier [Axis]: TMK Hawk Parent, Corp. | First lien 2                          
Principal Amount or Par Value $ 10,238 [15],[16],[21],[32]   $ 10,238 [15],[16],[21],[32]   $ 4,057 [19],[20],[23],[28]                
Spread 4.00% [15],[16],[32]   4.00% [15],[16],[32]   1.00% [19],[20],[28],[34] 4.00% [15],[16],[32] 4.00% [15],[16],[32] 1.00% [19],[20],[28],[34] 1.00% [19],[20],[28],[34]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 2,594                    
Fair value, ending balance $ 6,548 [15],[16],[32]   6,548 [15],[16],[32]   $ 2,594 [19],[20],[28]                
Investment, Identifier [Axis]: TMK Hawk Parent, Corp. | Subordinated 1                          
Principal Amount or Par Value 356 [15],[21],[30]   356 [15],[21],[30]   337 [19],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[27]     337                    
Fair value, ending balance 356 [15],[30]   356 [15],[30]   337 [19],[27]                
Investment, Identifier [Axis]: TMK Hawk Parent, Corp. | Subordinated 2                          
Principal Amount or Par Value 412 [15],[16],[21]   412 [15],[16],[21]   325 [19],[20],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20]     325                    
Fair value, ending balance 412 [15],[16]   412 [15],[16]   325 [19],[20]                
Investment, Identifier [Axis]: TVG-Edmentum Holdings, LLC / Edmentum Ultimate Holdings, LLC                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance     40,365 91,620 91,620                
Gross additions     3,119 [4]   6,967 [5]                
Gross redemptions     0 [6]   0 [7]                
Net Change In Unrealized Appreciation (Depreciation)     (9)   (58,222)                
Fair value, ending balance 43,475   43,475   40,365                
Net Realized Gains (Losses)     0   0                
Interest Income     2,454   4,357                
Dividend Income     666   2,594                
Other Income     125   250                
Investment, Identifier [Axis]: TVG-Edmentum Holdings, LLC | Class B-1 Common Shares                          
Principal Amount or Par Value 48,080   48,080   48,080                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [3],[20],[63]     5,000                    
Fair value, ending balance 5,000 [8],[16],[64]   5,000 [8],[16],[64]   5,000 [3],[20],[63]                
Investment, Identifier [Axis]: TVG-Edmentum Holdings, LLC | Class B-2 Common Shares                          
Principal Amount or Par Value 29,707   29,707   29,707                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [3],[20],[63]     0                    
Fair value, ending balance 0 [8],[16],[64]   0 [8],[16],[64]   0 [3],[20],[63]                
Investment, Identifier [Axis]: TVG-Edmentum Holdings, LLC | Series C-2 Preferred Units                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [3],[19],[20]     8,719                    
Fair value, ending balance 9,385 [8],[15],[16]   9,385 [8],[15],[16]   8,719 [3],[19],[20]                
Investment, Identifier [Axis]: Tempo Acquisition, LLC | First lien                          
Principal Amount or Par Value [16],[21],[32],[38] $ 27,536   $ 27,536                    
Spread [16],[32],[38] 1.75%   1.75%     1.75% 1.75%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [16],[32],[38] $ 23,354   $ 23,354                    
Investment, Identifier [Axis]: Tennessee Bidco Limited | First lien 1                          
Principal Amount or Par Value $ 20,017 [15],[16],[21],[32]   $ 20,017 [15],[16],[21],[32]   $ 19,815 [19],[20],[23],[28]                
Spread 3.50% [15],[16],[32],[35]   3.50% [15],[16],[32],[35]   3.50% [19],[20],[28],[34] 3.50% [15],[16],[32],[35] 3.50% [15],[16],[32],[35] 3.50% [19],[20],[28],[34] 3.50% [19],[20],[28],[34]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 19,815                    
Fair value, ending balance $ 20,017 [15],[16],[32]   20,017 [15],[16],[32]   $ 19,815 [19],[20],[28]                
Investment, Identifier [Axis]: Tennessee Bidco Limited | First lien 2                          
Principal Amount or Par Value $ 16,411 [15],[21],[29],[30]   $ 16,411 [15],[21],[29],[30]   $ 16,245 [19],[23],[26],[27]                
Spread 3.50% [15],[29],[30],[35]   3.50% [15],[29],[30],[35]   3.50% [19],[26],[27],[34] 3.50% [15],[29],[30],[35] 3.50% [15],[29],[30],[35] 3.50% [19],[26],[27],[34] 3.50% [19],[26],[27],[34]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 16,245                    
Fair value, ending balance $ 16,411 [15],[29],[30]   16,411 [15],[29],[30]   $ 16,245 [19],[26],[27]                
Investment, Identifier [Axis]: Tennessee Bidco Limited | First lien 3                          
Principal Amount or Par Value $ 899 [15],[21],[29],[30]   $ 899 [15],[21],[29],[30]   $ 890 [19],[23],[26],[27]                
Spread 3.50% [15],[29],[30],[35]   3.50% [15],[29],[30],[35]   3.50% [19],[26],[27],[34] 3.50% [15],[29],[30],[35] 3.50% [15],[29],[30],[35] 3.50% [19],[26],[27],[34] 3.50% [19],[26],[27],[34]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 890                    
Fair value, ending balance $ 899 [15],[29],[30]   899 [15],[29],[30]   $ 890 [19],[26],[27]                
Investment, Identifier [Axis]: TigerConnect, Inc. | First lien - Drawn 1                          
Principal Amount or Par Value [19],[23],[24],[27]         $ 3,741                
Spread [19],[24],[27]         6.25%     6.25% 6.25%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[24],[27]     3,741                    
Fair value, ending balance [19],[24],[27]         $ 3,741                
Investment, Identifier [Axis]: TigerConnect, Inc. | First lien - Drawn 2                          
Principal Amount or Par Value [19],[20],[23],[24]         $ 42                
Spread [19],[20],[24]         6.25%     6.25% 6.25%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     42                    
Fair value, ending balance [19],[20],[24]         $ 42                
Investment, Identifier [Axis]: TigerConnect, Inc. | First lien - Undrawn                          
Principal Amount or Par Value 4,267 [15],[16],[21],[22]   4,267 [15],[16],[21],[22]   4,267 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance (42) [15],[16],[22]   (42) [15],[16],[22]   0 [19],[20],[24]                
Investment, Identifier [Axis]: TigerConnect, Inc. | First lien 1                          
Principal Amount or Par Value $ 29,875 [15],[16],[21],[32]   $ 29,875 [15],[16],[21],[32]   $ 29,875 [19],[20],[23],[28]                
Spread 6.25% [15],[16],[32]   6.25% [15],[16],[32]   6.25% [19],[20],[28] 6.25% [15],[16],[32] 6.25% [15],[16],[32] 6.25% [19],[20],[28] 6.25% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 29,875                    
Fair value, ending balance $ 29,579 [15],[16],[32]   29,579 [15],[16],[32]   $ 29,875 [19],[20],[28]                
Investment, Identifier [Axis]: TigerConnect, Inc. | First lien 2                          
Principal Amount or Par Value $ 3,741 [15],[21],[30]   $ 3,741 [15],[21],[30]   $ 3,054 [19],[20],[23],[28]                
Spread 6.25% [15],[30]   6.25% [15],[30]   6.25% [19],[20],[28] 6.25% [15],[30] 6.25% [15],[30] 6.25% [19],[20],[28] 6.25% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 3,054                    
Fair value, ending balance $ 3,704 [15],[30]   3,704 [15],[30]   $ 3,054 [19],[20],[28]                
Investment, Identifier [Axis]: TigerConnect, Inc. | First lien 3                          
Principal Amount or Par Value [15],[16],[21],[32] $ 3,054   $ 3,054                    
Spread [15],[16],[32] 6.25%   6.25%     6.25% 6.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[32] $ 3,024   $ 3,024                    
Investment, Identifier [Axis]: TigerConnect, Inc. | First lien 4                          
Principal Amount or Par Value [15],[16],[21] $ 42   $ 42                    
Spread [15],[16] 6.25%   6.25%     6.25% 6.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16] $ 41   $ 41                    
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation | First lien - Undrawn                          
Principal Amount or Par Value 818 [15],[16],[21],[22]   818 [15],[16],[21],[22]   818 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [19],[20],[24]                
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation | First lien 1                          
Principal Amount or Par Value $ 8,303 [15],[21],[29],[30]   $ 8,303 [15],[21],[29],[30]   $ 8,345 [19],[23],[26],[27]                
Spread 4.25% [15],[29],[30]   4.25% [15],[29],[30]   4.50% [19],[26],[27] 4.25% [15],[29],[30] 4.25% [15],[29],[30] 4.50% [19],[26],[27] 4.50% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 8,345                    
Fair value, ending balance $ 8,303 [15],[29],[30]   8,303 [15],[29],[30]   $ 8,345 [19],[26],[27]                
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation | First lien 2                          
Principal Amount or Par Value $ 2,784 [15],[21],[29],[30]   $ 2,784 [15],[21],[29],[30]   $ 2,798 [19],[23],[26],[27]                
Spread 4.25% [15],[29],[30]   4.25% [15],[29],[30]   4.50% [19],[26],[27] 4.25% [15],[29],[30] 4.25% [15],[29],[30] 4.50% [19],[26],[27] 4.50% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 2,798                    
Fair value, ending balance $ 2,784 [15],[29],[30]   2,784 [15],[29],[30]   $ 2,798 [19],[26],[27]                
Investment, Identifier [Axis]: USRP Holdings, Inc. | First lien                          
Principal Amount or Par Value $ 12,331 [15],[21],[29],[30]   $ 12,331 [15],[21],[29],[30]   $ 12,396 [19],[23],[26],[27]                
Spread 4.75% [15],[29],[30]   4.75% [15],[29],[30]   5.00% [19],[26],[27] 4.75% [15],[29],[30] 4.75% [15],[29],[30] 5.00% [19],[26],[27] 5.00% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 12,396                    
Fair value, ending balance $ 12,331 [15],[29],[30]   12,331 [15],[29],[30]   $ 12,396 [19],[26],[27]                
Investment, Identifier [Axis]: USRP Holdings, Inc. | First lien - Undrawn                          
Principal Amount or Par Value 893 [15],[16],[21],[22]   893 [15],[16],[21],[22]   893 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [19],[20],[24]                
Investment, Identifier [Axis]: Ultimus Group Midco, LLC | First lien                          
Principal Amount or Par Value [19],[23],[26],[27]         $ 9,116                
Spread [19],[26],[27]         4.75%     4.75% 4.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     9,070                    
Fair value, ending balance [19],[26],[27]         $ 9,070                
Investment, Identifier [Axis]: Ultimus Group Midco, LLC | First lien - Undrawn 1                          
Principal Amount or Par Value [19],[20],[23],[24]         1,139                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     (6)                    
Fair value, ending balance [19],[20],[24]         (6)                
Investment, Identifier [Axis]: Ultimus Group Midco, LLC | First lien - Undrawn 2                          
Principal Amount or Par Value [19],[20],[23],[24]         3,039                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     (15)                    
Fair value, ending balance [19],[20],[24]         (15)                
Investment, Identifier [Axis]: UniTek Global Services, Inc.                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance     73,181 $ 107,524 107,524                
Gross additions     6,609 [10]   72,385 [11]                
Gross redemptions     0 [12]   (60,582) [13]                
Net Change In Unrealized Appreciation (Depreciation)     9,739   (46,146)                
Fair value, ending balance 89,529   89,529   73,181                
Net Realized Gains (Losses)     0   38,898                
Interest Income     0   516                
Dividend Income     6,610   10,851                
Other Income     500   1,070                
Investment, Identifier [Axis]: UniTek Global Services, Inc. | Ordinary Shares 1                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [14],[15],[30] 0   0                    
Investment, Identifier [Axis]: UniTek Global Services, Inc. | Ordinary Shares 2                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [14],[15],[16] 0   0                    
Investment, Identifier [Axis]: UniTek Global Services, Inc. | Ordinary shares 1                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [9],[19],[27]     0                    
Fair value, ending balance [9],[19],[27]         0                
Investment, Identifier [Axis]: UniTek Global Services, Inc. | Ordinary shares 2                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [9],[19],[20]     0                    
Fair value, ending balance [9],[19],[20]         0                
Investment, Identifier [Axis]: UniTek Global Services, Inc. | Preferred Shares 1                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [14],[15],[16] 71,095   71,095                    
Investment, Identifier [Axis]: UniTek Global Services, Inc. | Preferred Shares 2                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [14],[15],[16] 18,434   18,434                    
Investment, Identifier [Axis]: UniTek Global Services, Inc. | Preferred Shares 3                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [14],[15],[30] 0   0                    
Investment, Identifier [Axis]: UniTek Global Services, Inc. | Preferred Shares 4                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [14],[15],[16] 0   0                    
Investment, Identifier [Axis]: UniTek Global Services, Inc. | Preferred Shares 5                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [14],[15],[16] 0   0                    
Investment, Identifier [Axis]: UniTek Global Services, Inc. | Preferred shares 1                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [9],[19],[20]     64,486                    
Fair value, ending balance [9],[19],[20]         64,486                
Investment, Identifier [Axis]: UniTek Global Services, Inc. | Preferred shares 2                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [9],[19],[20]     8,695                    
Fair value, ending balance [9],[19],[20]         8,695                
Investment, Identifier [Axis]: UniTek Global Services, Inc. | Preferred shares 3                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [9],[19],[27]     0                    
Fair value, ending balance [9],[19],[27]         0                
Investment, Identifier [Axis]: UniTek Global Services, Inc. | Preferred shares 4                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [9],[19],[20]     0                    
Fair value, ending balance [9],[19],[20]         0                
Investment, Identifier [Axis]: Vehlo Purchaser, LLC | First lien                          
Principal Amount or Par Value $ 6,042 [15],[16],[21]   $ 6,042 [15],[16],[21]   $ 6,073 [20],[23]                
Spread 5.25% [15],[16]   5.25% [15],[16]   5.50% [20] 5.25% [15],[16] 5.25% [15],[16] 5.50% [20] 5.50% [20]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [20]     $ 6,042                    
Fair value, ending balance $ 6,020 [15],[16]   6,020 [15],[16]   $ 6,042 [20]                
Investment, Identifier [Axis]: Viper Bidco,Inc. | First lien 1                          
Principal Amount or Par Value 15,718   15,718                    
Investment, Identifier [Axis]: Viper Bidco. Inc. | First lien - Undrawn 1                          
Principal Amount or Par Value 1,838 [15],[16],[21],[22]   1,838 [15],[16],[21],[22]   1,838 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance (36) [15],[16],[22]   (36) [15],[16],[22]   0 [19],[20],[24]                
Investment, Identifier [Axis]: Viper Bidco. Inc. | First lien - Undrawn 2                          
Principal Amount or Par Value 3,320 [15],[16],[21],[22]   3,320 [15],[16],[21],[22]   3,320 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance $ (65) [15],[16],[22]   $ (65) [15],[16],[22]   0 [19],[20],[24]                
Investment, Identifier [Axis]: Viper Bidco. Inc. | First lien 1                          
Principal Amount or Par Value         $ 16,051   £ 11,850 [15],[16],[21],[32],[64]   £ 11,910 [19],[20],[23],[28],[63]        
Spread 4.50% [15],[16],[32],[64]   4.50% [15],[16],[32],[64]   4.75% [19],[20],[28],[63] 4.50% [15],[16],[32],[64] 4.50% [15],[16],[32],[64] 4.75% [19],[20],[28],[63] 4.75% [19],[20],[28],[63]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28],[63]     $ 16,051                    
Fair value, ending balance $ 15,563 [15],[16],[32],[64]   15,563 [15],[16],[32],[64]   $ 16,051 [19],[20],[28],[63]                
Investment, Identifier [Axis]: Viper Bidco. Inc. | First lien 2                          
Principal Amount or Par Value $ 2,294 [15],[16],[21],[32]   $ 2,294 [15],[16],[21],[32]   $ 2,306 [19],[20],[23],[28]                
Spread 4.50% [15],[16],[32]   4.50% [15],[16],[32]   4.75% [19],[20],[28] 4.50% [15],[16],[32] 4.50% [15],[16],[32] 4.75% [19],[20],[28] 4.75% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 2,306                    
Fair value, ending balance $ 2,249 [15],[16],[32]   2,249 [15],[16],[32]   $ 2,306 [19],[20],[28]                
Investment, Identifier [Axis]: WEG Sub Intermediate Holdings, LLC | Subordinated                          
Principal Amount or Par Value 4,977 [15],[16],[21]   4,977 [15],[16],[21]   4,665 [19],[20],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20]     4,665                    
Fair value, ending balance 4,977 [15],[16]   4,977 [15],[16]   4,665 [19],[20]                
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC | First lien - Undrawn                          
Principal Amount or Par Value 2,040 [15],[16],[21],[22]   2,040 [15],[16],[21],[22]   2,040 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [19],[20],[24]                
Investment, Identifier [Axis]: Xactly Corporation | First lien                          
Principal Amount or Par Value $ 22,500 [15],[21],[25]   $ 22,500 [15],[21],[25]   $ 22,500 [19],[23],[31]                
Spread 6.25% [15],[25]   6.25% [15],[25]   6.25% [19],[31] 6.25% [15],[25] 6.25% [15],[25] 6.25% [19],[31] 6.25% [19],[31]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[31]     $ 22,232                    
Fair value, ending balance $ 21,233 [15],[25]   21,233 [15],[25]   $ 22,232 [19],[31]                
Investment, Identifier [Axis]: Xactly Corporation | First lien - Undrawn                          
Principal Amount or Par Value 992 [15],[16],[21],[22]   992 [15],[16],[21],[22]   992 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     (12)                    
Fair value, ending balance (56) [15],[16],[22]   (56) [15],[16],[22]   (12) [19],[20],[24]                
Investment, Identifier [Axis]: YLG Holdings, Inc. | First lien - Drawn                          
Principal Amount or Par Value [19],[20],[23],[24]         $ 394                
Spread [19],[20],[24]         4.75%     4.75% 4.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     394                    
Fair value, ending balance [19],[20],[24]         $ 394                
Investment, Identifier [Axis]: YLG Holdings, Inc. | First lien - Drawn 1                          
Principal Amount or Par Value [15],[16],[21],[22] $ 392   $ 392                    
Spread [15],[16],[22] 4.75%   4.75%     4.75% 4.75%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] $ 392   $ 392                    
Investment, Identifier [Axis]: YLG Holdings, Inc. | First lien - Drawn 2                          
Principal Amount or Par Value [15],[16],[21],[22] $ 29   $ 29                    
Spread [15],[16],[22] 4.75%   4.75%     4.75% 4.75%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] $ 29   $ 29                    
Investment, Identifier [Axis]: YLG Holdings, Inc. | First lien - Undrawn 1                          
Principal Amount or Par Value 271 [15],[16],[21],[22]   271 [15],[16],[21],[22]   271 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [19],[20],[24]                
Investment, Identifier [Axis]: YLG Holdings, Inc. | First lien - Undrawn 2                          
Principal Amount or Par Value 281 [15],[16],[21],[22]   281 [15],[16],[21],[22]   309 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [19],[20],[24]                
Investment, Identifier [Axis]: YLG Holdings, Inc. | First lien 1                          
Principal Amount or Par Value $ 21,552 [15],[21],[40]   $ 21,552 [15],[21],[40]   $ 21,661 [19],[23],[41]                
Spread 4.75% [15],[40]   4.75% [15],[40]   4.75% [19],[41] 4.75% [15],[40] 4.75% [15],[40] 4.75% [19],[41] 4.75% [19],[41]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[41]     $ 21,661                    
Fair value, ending balance $ 21,552 [15],[40]   21,552 [15],[40]   $ 21,661 [19],[41]                
Investment, Identifier [Axis]: YLG Holdings, Inc. | First lien 2                          
Principal Amount or Par Value $ 4,287 [15],[21],[29],[30]   $ 4,287 [15],[21],[29],[30]   $ 4,309 [19],[23],[26],[27]                
Spread 4.75% [15],[29],[30]   4.75% [15],[29],[30]   4.75% [19],[26],[27] 4.75% [15],[29],[30] 4.75% [15],[29],[30] 4.75% [19],[26],[27] 4.75% [19],[26],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     $ 4,309                    
Fair value, ending balance $ 4,287 [15],[29],[30]   4,287 [15],[29],[30]   $ 4,309 [19],[26],[27]                
Investment, Identifier [Axis]: eResearchTechnology, Inc. | First lien - Drawn                          
Principal Amount or Par Value [19],[20],[23],[24],[28]         $ 301                
Spread [19],[20],[24],[28]         4.75%     4.75% 4.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24],[28]     301                    
Fair value, ending balance [19],[20],[24],[28]         $ 301                
Investment, Identifier [Axis]: eResearchTechnology, Inc. | First lien - Undrawn 1                          
Principal Amount or Par Value [19],[20],[23],[24]         1,847                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance [19],[20],[24]         0                
Investment, Identifier [Axis]: eResearchTechnology, Inc. | First lien - Undrawn 2                          
Principal Amount or Par Value [19],[20],[23],[24]         1,074                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     0                    
Fair value, ending balance [19],[20],[24]         0                
Investment, Identifier [Axis]: eResearchTechnology, Inc. | First lien 1                          
Principal Amount or Par Value [19],[23],[26],[27]         $ 11,380                
Spread [19],[26],[27]         4.75%     4.75% 4.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[26],[27]     11,380                    
Fair value, ending balance [19],[26],[27]         $ 11,380                
Investment, Identifier [Axis]: eResearchTechnology, Inc. | First lien 2                          
Principal Amount or Par Value [19],[20],[23],[28]         $ 1,889                
Spread [19],[20],[28]         4.75%     4.75% 4.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     1,889                    
Fair value, ending balance [19],[20],[28]         $ 1,889                
Investment, Identifier [Axis]: iCIMS, Inc. | First lien - Drawn                          
Principal Amount or Par Value $ 1,024 [15],[16],[21],[22]   $ 1,024 [15],[16],[21],[22]   $ 1,165 [19],[20],[23],[24]                
Spread 5.75% [15],[16],[22]   5.75% [15],[16],[22]   5.75% [19],[20],[24] 5.75% [15],[16],[22] 5.75% [15],[16],[22] 5.75% [19],[20],[24] 5.75% [19],[20],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     $ 1,134                    
Fair value, ending balance $ 959 [15],[16],[22]   959 [15],[16],[22]   $ 1,134 [19],[20],[24]                
Investment, Identifier [Axis]: iCIMS, Inc. | First lien - Undrawn                          
Principal Amount or Par Value 2,506 [15],[16],[21],[22]   2,506 [15],[16],[21],[22]   2,365 [19],[20],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[24]     (64)                    
Fair value, ending balance (159) [15],[16],[22]   (159) [15],[16],[22]   (64) [19],[20],[24]                
Investment, Identifier [Axis]: iCIMS, Inc. | First lien 1                          
Principal Amount or Par Value $ 7,366 [15],[16],[21],[32]   $ 7,366 [15],[16],[21],[32]   $ 44,742 [19],[20],[23],[28]                
Spread 6.25% [15],[16],[32]   6.25% [15],[16],[32]   5.75% [19],[20],[28] 6.25% [15],[16],[32] 6.25% [15],[16],[32] 5.75% [19],[20],[28] 5.75% [19],[20],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 43,538                    
Fair value, ending balance $ 6,986 [15],[16],[32]   6,986 [15],[16],[32]   $ 43,538 [19],[20],[28]                
Investment, Identifier [Axis]: iCIMS, Inc. | First lien 2                          
Principal Amount or Par Value [19],[20],[23],[28]         $ 7,366                
Spread [19],[20],[28]         6.25%     6.25% 6.25%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19],[20],[28]     $ 7,253                    
Fair value, ending balance [19],[20],[28]         $ 7,253                
[1] New Mountain Finance Corporation (the "Company") generally acquires its investments in private transactions exempt from registration under the Securities Act of 1933, as amended (the "Securities Act"). These investments are generally subject to certain limitations on resale, and may be deemed to be "restricted securities" under the Securities Act.
[2] New Mountain Finance Corporation (the "Company") generally acquires its investments in private transactions exempt from registration under the Securities Act of 1933, as amended (the "Securities Act"). These investments are generally subject to certain limitations on resale, and may be deemed to be "restricted securities" under the Securities Act.
[3] Denotes investments in which the Company is an “Affiliated Person”, as defined in the Investment Company Act of 1940, as amended (the "1940 Act"), due to owning or holding the power to vote 5.0% or more of the outstanding voting securities of the investment but not controlling the company. Fair value as of December 31, 2025 and December 31, 2024 along with transactions during the year ended December 31, 2025 in which the issuer was a non-controlled/affiliated investment is as follows:
Portfolio CompanyFair Value at December 31, 2024Gross
Additions (A)		Gross
Redemptions
(B)		Net Change In Unrealized Appreciation (Depreciation)Fair Value at December 31, 2025Net Realized Gains (Losses)Interest
Income		Dividend
Income		Other
Income
Eagle Infrastructure Services, LLC (fka FR Arsenal Holdings II Corp.) / Eagle Infrastructure Super HoldCo, LLC$19,156 $— $— $(819)$18,337 $— $1,321 $— $— 
Sierra Hamilton Holdings Corporation2,000 — — — 2,000 — — — — 
TVG-Edmentum Holdings, LLC / Edmentum Ultimate Holdings, LLC91,620 6,967 — (58,222)40,365 — 4,357 2,594 250 
Total Non-Controlled/Affiliated Investments$112,776 $6,967 $— $(59,041)$60,702 $— $5,678 $2,594 $250 
(A)Gross additions include increases in the cost basis of investments resulting from new portfolio investments, payment-in-kind (“PIK”) interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
(B)Gross redemptions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[4] Gross additions include increases in the cost basis of investments resulting from new portfolio investments, payment-in-kind (“PIK”) interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
[5] Gross additions include increases in the cost basis of investments resulting from new portfolio investments, payment-in-kind (“PIK”) interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
[6] Gross redemptions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[7] Gross redemptions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[8] Denotes investments in which the Company is an “Affiliated Person”, as defined in the Investment Company Act of 1940, as amended (the "1940 Act"), due to owning or holding the power to vote 5.0% or more of the outstanding voting securities of the investment but not controlling the company. Fair value as of June 30, 2026 and December 31, 2025, along with transactions during the six months ended June 30, 2026 in which the issuer was a non-controlled/affiliated investment, is as follows:
Portfolio CompanyFair Value at December 31, 2025Gross Additions (A)Gross Redemptions (B)Net Change In Unrealized Appreciation (Depreciation)Fair Value at June 30, 2026Net Realized Gains (Losses)Interest IncomeDividend IncomeOther Income
Eagle Infrastructure Services, LLC (fka FR Arsenal Holdings II Corp.) / Eagle Infrastructure Super HoldCo, LLC$18,337 $— $— $6,141 $24,478 $— $625 $735 $— 
Sierra Hamilton Holdings Corporation2,000 — — — 2,000 — — — — 
TVG-Edmentum Holdings, LLC / Edmentum Ultimate Holdings, LLC40,365 3,119 — (9)43,475 — 2,454 666 125 
Total Non-Controlled/Affiliated Investments$60,702 $3,119 $— $6,132 $69,953 $— $3,079 $1,401 $125 
(A)Gross additions include increases in the cost basis of investments resulting from new portfolio investments, payment-in-kind (“PIK”) interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
(B)Gross redemptions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[9] Denotes investments in which the Company “Controls”, as defined in the 1940 Act, due to owning or holding the power to vote more than 25.0% of the outstanding voting securities of the investment. Fair value as of December 31, 2025 and December 31, 2024 along with transactions during the year ended December 31, 2025 in which the issuer was a controlled investment, is as follows:
Portfolio CompanyFair Value at December 31, 2024Gross
Additions
(A)		Gross
Redemptions
(B)		Net Change In
Unrealized
Appreciation
(Depreciation)		Fair Value at December 31, 2025Net Realized Gains (Losses)Interest
Income		Dividend
Income		Other
Income
National HME, Inc./NHME Holdings Corp.$3,000 $— $— $(3,000)$— $— $— $— $— 
New Benevis Topco, LLC / New Benevis Holdco, Inc.140,102 21,456 — (7,094)154,464 — 14,309 — 1,383 
New Permian Holdco, Inc. / New Permian Holdco, L.L.C.63,076 7,657 — (6,900)63,833 — 5,759 — 500 
NM NL Holdings, L.P.104,512 — — 1,584 106,096 — — 8,740 — 
NM GP Holdco, LLC322 — — 68 390 — — 44 — 
NM YI LLC9,960 — — (1,319)8,641 — — 886 — 
NMFC Senior Loan Program III LLC160,000 — — — 160,000 — — 22,600 — 
NMFC Senior Loan Program IV LLC112,400 — — — 112,400 — — 15,315 — 
UniTek Global Services, Inc.107,524 72,385 (60,582)(46,146)73,181 38,898 516 10,851 1,070 
Total Controlled Investments$700,896 $101,498 $(60,582)$(62,807)$679,005 $38,898 $20,584 $58,436 $2,953 

(A)Gross additions include increases in the cost basis of investments resulting from new portfolio investments, PIK interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
(B)Gross redemptions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[10] Gross additions include increases in the cost basis of investments resulting from new portfolio investments, PIK interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
[11] Gross additions include increases in the cost basis of investments resulting from new portfolio investments, PIK interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
[12] Gross redemptions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[13] Gross redemptions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[14] Denotes investments in which the Company "controls", as defined in the 1940 Act, due to owning or holding the power to vote more than 25.0% of the outstanding voting securities of the investment. Fair value as of June 30, 2026 and December 31, 2025, along with transactions during the six months ended June 30, 2026 in which the issuer was a controlled investment, is as follows:
Portfolio CompanyFair Value at December 31, 2025Gross Additions (A)Gross Redemptions (B)Net Change In Unrealized Appreciation (Depreciation)Fair Value at June 30, 2026Net Realized Gains (Losses)Interest IncomeDividend IncomeOther Income
National HME, Inc./NHME Holdings Corp.$— $— $(12,872)$12,872 $— $(12,872)$— $— $— 
New Benevis Topco, LLC / New Benevis Holdco, Inc.154,464 7,255 (76,831)5,199 90,087 (5,717)5,147 — — 
New Permian Holdco, Inc. / New Permian Holdco, L.L.C.63,833 2,982 — (1,000)65,815 — 2,983 — 250 
NM NL Holdings, L.P.106,096 5,926 (3,729)4,010 112,303 (2)— 4,400 99 
NM GP Holdco, LLC390 75 (19)(28)418 — — 22 — 
NM YI LLC8,641 — — 46 8,687 — — 466 — 
NMFC Senior Loan Program III LLC160,000 — — (2,128)157,872 — — 10,560 — 
NMFC Senior Loan Program IV LLC112,400 — — (6,868)105,532 — — 7,166 — 
UniTek Global Services, Inc.73,181 6,609 — 9,739 89,529 — — 6,610 500 
Total Controlled Investments$679,005 $22,847 $(93,451)$21,842 $630,243 $(18,591)$8,130 $29,224 $849 
(A)Gross additions include increases in the cost basis of investments resulting from new portfolio investments, PIK interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
(B)Gross redemptions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[15] The fair value of the Company's investment is determined using unobservable inputs that are significant to the overall fair value measurement. See Note 4. Fair Value, for details
[16] Investment is held by New Mountain Finance Corporation.
[17] The Company holds ordinary shares in AAC Lender Holdings, LLC and two first lien term loans, a first lien revolver and subordinated notes in American Achievement Corporation, a partially-owned subsidiary of AAC Lender Holdings, LLC.
[18] The Company holds ordinary shares in AAC Lender Holdings, LLC and two first lien term loans, a first lien revolver and subordinated notes in American Achievement Corporation, a partially-owned subsidiary of AAC Lender Holdings, LLC.
[19] The fair value of the Company's investment is determined using unobservable inputs that are significant to the overall fair value measurement. See Note 4. Fair Value, for details.
[20] Investment is held by New Mountain Finance Corporation
[21] Par amount is denominated in United States Dollar unless otherwise noted, which may include British Pound ("£") and/or Euro ("€")
[22] Par value amounts represent the drawn or undrawn (as indicated in type of investment) portion of revolvers or delayed draws. Cost amounts represent the cash received at settlement date net of the impact of paydowns and cash paid for drawn revolvers or delayed draws
[23] Par amount is denominated in United States Dollar unless otherwise noted, which may include British Pound ("£") and/or Euro ("€").
[24] Par value amounts represent the drawn or undrawn (as indicated in type of investment) portion of revolving credit facilities or delayed draws. Cost amounts represent the cash received at settlement date net of the impact of paydowns and cash paid for drawn revolvers or delayed draws.
[25] Investment is held by New Mountain Finance SBIC, L.P.
[26] Investment is pledged as collateral for the Holdings Credit Facility, a revolving credit facility among the Company, as the Collateral Manager, New Mountain Finance Holdings, L.L.C. as the Borrower, Wells Fargo Securities, LLC, as the Administrative Agent, and Wells Fargo Bank, National Association, as the Lender and Collateral Custodian.. See Note 7. Borrowings, for details.
[27] Investment is held by New Mountain Finance Holdings, L.L.C.
[28] Investment is pledged as collateral for the NMFC Credit Facility, a revolving credit facility among the Company as the Borrower, Sumitomo Mitsui Banking Corporation, as administrative agent, sole lead arranger, and sole book runner, and the lenders party thereto. See Note 7. Borrowings, for details
[29] Investment is pledged as collateral for the Holdings Credit Facility, a revolving credit facility among the Company, as the Collateral Manager, New Mountain Finance Holdings, L.L.C. as the Borrower, Wells Fargo Securities, LLC, as the Administrative Agent, and Wells Fargo Bank, National Association, as the Lender and Collateral Custodian. See Note 7. Borrowings, for details
[30] Investment is held by New Mountain Finance Holdings, L.L.C.
[31] Investment is held by New Mountain Finance SBIC, L.P.
[32] Investment is pledged as collateral for the NMFC Credit Facility, a revolving credit facility among the Company as the Borrower, Sumitomo Mitsui Banking Corporation, as administrative agent, sole lead arranger, and sole book runner, and the lenders party thereto. See Note 7. Borrowings, for details
[33] The Company holds investments in ACI Parent Inc. and a wholly-owned subsidiary of ACI Parent Inc. The Company holds a first lien term loan, two first lien delayed draws and a first lien revolver in ACI Group Holdings, Inc. and preferred equity in ACI Parent Inc. . The Company's preferred equity investment is entitled to receive cumulative preferred dividends that are calculated using the stated value of the Company's equity investment plus the aggregate unpaid compounded dividends as of the date of determination. As of December 31, 2025, the Company's stated value of its equity investment, plus unpaid compounded dividends, was $20,249.
[34] All or a portion of interest contains PIK interest.
[35] All or a portion of interest contains PIK interest. See Note 2. Summary of Significant Accounting Policies-Revenue Recognition, for details.
[36] Investment is on non-accrual status as of June 30, 2026. See Note 3. Investments, for details.
[37] Investment is on non-accrual status as of December 31, 2025. See Note 3. Investments, for details.
[38] Indicates assets that the Company deems to be “non-qualifying assets” under Section 55(a) of the 1940 Act. Qualifying assets must represent at least 70.0% of the Company’s total assets at the time of acquisition of any additional non-qualifying assets. As of June 30, 2026, 19.7% of the Company’s total assets are represented by investments at fair value that are considered non-qualifying assets.
[39] Indicates assets that the Company deems to be “non-qualifying assets” under Section 55(a) of the 1940 Act. Qualifying assets must represent at least 70.0% of the Company’s total assets at the time of acquisition of any additional non-qualifying assets. As of December 31, 2025, 15.4% of the Company’s total assets are represented by investments at fair value that are considered non-qualifying assets.
[40] Investment is held by New Mountain Finance SBIC II, L.P.
[41] Investment is held by New Mountain Finance SBIC II, L.P.
[42] The Company's preferred equity investment in Dealer Tire Holdings, LLC is entitled to receive cumulative preferred dividends that are calculated using the stated value of the Company's equity investment plus the aggregate unpaid compounded dividends as of the date of determination. As of June 30, 2026, the Company's stated value of its share, plus unpaid compounded dividends, was $27,116.
[43] The Company's preferred equity investment in Dealer Tire Holdings, LLC is entitled to receive cumulative preferred dividends that are calculated using the stated value of the Company's equity investment plus the aggregate unpaid compounded dividends as of the date of determination. As of December 31, 2025, the Company's stated value of its share, plus unpaid compounded dividends, was $90,671.
[44] The Company holds investments in two wholly-owned subsidiaries of Diamond Parent Holdings Corp. The Company holds two first lien term loans, a first lien delayed draw and a first lien revolver in Diligent Corporation and preferred equity in Diligent Preferred Issuer Inc. The Company's preferred equity investment is entitled to receive cumulative preferred dividends that are calculated using the stated value of the Company's equity investment plus the aggregate unpaid compounded dividends as of the date of determination. As of December 31, 2025, the Company's stated value of its equity investment, plus unpaid compounded dividends, was $15,827.
[45] The Company holds preferred equity in Eclipse Topco, Inc. and a first lien term loan, a first lien revolver and a first lien delayed draw in Eclipse Buyer, Inc., a wholly-owned subsidiary of Eclipse Topco, Inc. The Company's preferred equity investment is entitled to receive cumulative preferred dividends that are calculated using the stated value of the Company's equity investment plus the aggregate unpaid compounded dividends as of the date of determination. As of June 30, 2026, the Company's stated value of its equity investment, plus unpaid compounded dividends, was $1,632.
[46] The Company holds preferred equity in Eclipse Topco, Inc. and a first lien term loan, a first lien revolver and a first lien delayed draw in Eclipse Buyer, Inc., a wholly-owned subsidiary of Eclipse Topco, Inc. The Company's preferred equity investment is entitled to receive cumulative preferred dividends that are calculated using the stated value of the Company's equity investment plus the aggregate unpaid compounded dividends as of the date of determination. As of December 31, 2025, the Company's stated value of its equity investment, plus unpaid compounded dividends, was $2,226.
[47] The Company holds preferred shares and Class B-1 and Class B-2 of common equity in TVG-Edmentum Holdings, LLC and subordinated notes in Edmentum Ultimate Holdings, LLC, a wholly-owned subsidiary of TVG-Edmentum Holdings, LLC. As of June 30, 2026, the Company's stated value of the Company's Class B-1 and Class B-2 common equity investments, plus unpaid compounded dividends, was $48,080 and $29,707, respectively.
[48] The Company holds ordinary shares and Class B-1 and B-2 of preferred equity in TVG-Edmentum Holdings, LLC, and subordinated notes in Edmentum Ultimate Holdings, LLC, a wholly-owned subsidiary of TVG-Edmentum Holdings, LLC. As of December 31, 2025, the Company's stated value of the Company's Class B-1 and Class B-2 preferred equity investments, plus unpaid compounded dividends, was $48,080 and $29,707, respectively.
[49] The Company holds ordinary shares in FS WhiteWater Holdings, LLC, and a first lien term loan, a first lien revolver, and five first lien delayed draws in FS WhiteWater Borrower, LLC, a partially-owned subsidiary of FS WhiteWater Holdings, LLC.
[50] The Company holds ordinary shares in FS WhiteWater Holdings, LLC, and a first lien term loan, a first lien revolver, and five first lien delayed draws in FS WhiteWater Borrower, LLC, a partially-owned subsidiary of FS WhiteWater Holdings, LLC.
[51] The Company holds an LP Interest in Firebird Co-Invest L.P. and holds a first lien term loan, a first lien delayed and a first lien revolver in Firebird Acquisition Corp, Inc., a wholly-owned subsidiary of Firebird Co-Invest L.P.
[52] The Company holds an LP Interest in Firebird Co-Invest L.P. and a first lien term loan, a first lien delayed and a first lien revolver in Firebird Acquisition Corp, Inc., a wholly-owned subsidiary of Firebird Co-Invest L.P.
[53] The Company's common equity investment in HBWM Holdings, LLC. is entitled to receive cumulative return that are calculated using the unreturned original investment plus any unpaid capitalized dividends. As of June 30, 2026, the Company's unreturned original investment, plus any unpaid compounded dividends, was $4,810.
[54] Investment is held by NMF HB, Inc.
[55] The Company's common equity investment in HBWM Holdings, LLC. is entitled to receive cumulative return that are calculated using the unreturned original investment plus any unpaid capitalized dividends. As of December 31, 2025, the Company's unreturned original investment, plus any unpaid compounded dividends, was $4,776.
[56] Investment is held by NMF HB, Inc.
[57] The Company holds Class A-1 common units in Jawbreaker Topco, L.P., and two first lien term loans, a first lien delayed draw term loan and a first lien revolver in Jawbreaker Parent, Inc, a wholly-owned subsidiary of Jawbreaker Topco, L.P.
[58] The Company's preferred equity investment in Knockout Intermediate Holdings I, Inc. is entitled to receive cumulative preferred dividends that are calculated using the stated value of the Company's equity investment plus the aggregate unpaid compounded dividends as of the date of determination. As of June 30, 2026, the Company's stated value of its share, plus unpaid compounded dividends, was $14,279.
[59] The Company's preferred equity investment in Knockout Intermediate Holdings I, Inc. is entitled to receive cumulative preferred dividends that are calculated using the stated value of the Company's equity investment plus the aggregate unpaid compounded dividends as of the date of determination. As of December 31, 2025, the Company's stated value of its share, plus unpaid compounded dividends, was $13,323.
[60] The Company holds ordinary shares and warrants in NHME Holdings Corp., as well as a second lien Tranche A Term Loan in National HME, Inc., a wholly-owned subsidiary of NHME Holdings Corp. The second lien Tranche A Term Loan is entitled to receive 20% of the interest earned on the first lien Tranche A Term Loan, which accrues interest at a rate of SOFR + 5.00%, and 20% of the interest earned on the first lien Tranche B Term Loan, which accrues interest at a rate of SOFR + 6.00%.
[61] Investment is held by New Mountain Net Lease Corporation.
[62] Investment is held by New Mountain Net Lease Corporation.
[63] Investment is denominated in foreign currency and is translated into U.S. dollars as of the valuation date. As of December 31, 2025, the par value U.S. dollar equivalent of the Viper Bidco, Inc. first lien term loans is $16,051 and the Nelipak Holding Company first lien term loan, undrawn delayed draw term loan, undrawn revolver and drawn revolver is $19,212, $7,529, $1,282 and $123, respectively. See Note 2. Summary of Significant Accounting Policies, for details.
[64] Investment is denominated in foreign currency and is translated into U.S. dollars as of the valuation date. As of June 30, 2026, the par value U.S. dollar equivalent of the Viper Bidco, Inc. first lien term loans is $15,718 and the Nelipak Holding Company first lien term loan, undrawn delayed draw term loan and undrawn revolver is $18,589, $7,322 and $1,366, respectively. See Note 2. Summary of Significant Accounting Policies, for details.
[65] The Company holds common units in Notorious Buyer, LLC, and a first lien term loan, a subordinated loan, and a first lien revolver in Notorious Topco, LLC and Notorious Holdings, LLC, two wholly-owned subsidiaries of Notorious Buyer, LLC.
[66] The Company holds common units in Notorious Buyer, LLC, and a first lien term loan, a subordinated loan, and a first lien revolver in Notorious Topco, LLC and Notorious Holdings, LLC, two wholly-owned subsidiaries of Notorious Buyer, LLC.
[67] The Company holds one claim related to a collateralized agreement to resell on its Consolidated Statement of Assets and Liabilities with a cost basis of $30,000 and a fair value of $5,700 as of June 30, 2026. See Note 2. Summary of Significant Accounting Policies, for details.
[68] The Company holds one security purchased under a collateralized agreement to resell on its Consolidated Statement of Assets and Liabilities with a cost basis of $30,000 and a fair value of $13,500 as of December 31, 2025. See Note 2. Summary of Significant Accounting Policies, for details.
[69] Investment is held by NMF Permian Holdings, LLC.
[70] Investment is held by NMF Permian Holdings, LLC.
[71] Investment is held by NMF Pioneer, Inc.
[72] Investment is held by NMF Pioneer, Inc.
[73] The Company holds Class A-1 Common Units in Ambrosia Topco LLC and two first lien term loans, two subordinated loans and a first lien delayed draw in TMK Hawk Parent, Corp., a wholly-owned subsidiary of Ambrosia Topco LLC
[74] The Company holds Class A-1 Common Units in Ambrosia Topco LLC and two first lien term loans, a subordinated loan and a first lien delayed draw in TMK Hawk Parent, Corp., a wholly-owned subsidiary of Ambrosia Topco LLC.