v3.26.3
Fair Value of Financial Instruments - Schedule of Reconciliation Changes for Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Significant Unobservable Inputs (Level 3) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 4,425,009 $ 3,613,959
Net Realized Gains (Losses) 2,310 (54,913)
Net Change in Unrealized Appreciation (Depreciation) (17,578) 42,920
Purchases 1,449,521 1,360,918
Capitalized PIK Interest 36,811 41,536
Sales (79,544) (74,392)
Repayments (1,014,775) (690,976)
Gross Transfers into Level 3 7,359 22,558
Gross Transfers out of Level 3 (8,991) (22,558)
Ending balance 4,800,122 4,239,052
Accounts Payable and Accrued Liabilities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance (87) (1,012)
Net Realized Gains (Losses)   (568)
Net Change in Unrealized Appreciation (Depreciation)   1,534
Purchases 4 2,003
Sales (8) (1,991)
Ending balance (91) (34)
Preferred Stock    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 52,735 53,802
Net Realized Gains (Losses) 3,090  
Net Change in Unrealized Appreciation (Depreciation) 1,050 (6,309)
Purchases 10,149 4,329
Sales (7,922)  
Gross Transfers out of Level 3 (1,331)  
Ending balance 57,771 51,822
Common Stock    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 64,720 44,593
Net Realized Gains (Losses) (2,217) (645)
Net Change in Unrealized Appreciation (Depreciation) (13,154) 2,969
Purchases 3,260 975
Sales (1,000) (1,606)
Gross Transfers into Level 3 7,359 22,558
Gross Transfers out of Level 3   (5,094)
Ending balance 58,968 63,750
Warrants    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 28,061 21,823
Net Realized Gains (Losses) 3,273 607
Net Change in Unrealized Appreciation (Depreciation) 8,538 1,419
Purchases 4,293 5,372
Sales (7,053) (1,410)
Gross Transfers out of Level 3 (301)  
Ending balance 36,811 27,811
Senior Secured Debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 4,209,798 3,419,044
Net Realized Gains (Losses) (1,810) (54,380)
Net Change in Unrealized Appreciation (Depreciation) (10,558) 42,790
Purchases 1,422,918 1,346,167
Capitalized PIK Interest 34,100 37,527
Sales (63,483) (67,521)
Repayments (1,014,775) (690,976)
Gross Transfers out of Level 3 (7,359) (5,242)
Ending balance 4,568,831 4,027,409
Unsecured Debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 69,614 75,557
Net Change in Unrealized Appreciation (Depreciation) (3,380) 547
Purchases 8,201 258
Capitalized PIK Interest 2,711 4,009
Gross Transfers out of Level 3   (12,222)
Ending balance 77,146 68,149
Escrow Receivables    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 168 152
Net Realized Gains (Losses) (26) 73
Net Change in Unrealized Appreciation (Depreciation) (74) (30)
Purchases 696 1,814
Sales (78) (1,864)
Ending balance $ 686 $ 145