v3.26.1
Fair Value - Schedule of Changes in Fair Value of Level III Portfolio Investments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Total        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 2,242,253 $ 2,956,224 $ 2,698,434 $ 2,987,078
Purchases, including capitalized PIK and revolver fundings 114,753 135,748 228,573 339,322
Proceeds from sales and paydowns of investments (138,955) (159,810) (632,296) (387,368)
Transfers into Level III 20,397 9,196 27,018 12,440
Transfers out of Level III (2,755)   (18,039)  
Ending balance 2,229,035 2,920,263 2,229,035 2,920,263
Net change in unrealized (depreciation) appreciation for the period relating to those Level III assets that were still held by the Company at the end of the period: (5,277) (22,375) (42,280) (29,928)
Total | Income Statement Location [Axis]: us-gaap:DebtAndEquitySecuritiesRealizedGainLoss        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gains or losses included in earnings: (44,942) 13,405 (75,632) 51,071
Total | Income Statement Location [Axis]: us-gaap:DebtAndEquitySecuritiesUnrealizedGainLoss        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gains or losses included in earnings: 38,284 (34,500) 977 (82,280)
First lien        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 1,435,322 1,929,645 1,774,636 1,902,610
Purchases, including capitalized PIK and revolver fundings 83,857 126,657 177,674 252,412
Proceeds from sales and paydowns of investments (127,487) (123,057) (518,070) (221,133)
Transfers into Level III 11,492 0 18,113 0
Transfers out of Level III 0   0  
Ending balance 1,394,174 1,927,366 1,394,174 1,927,366
Net change in unrealized (depreciation) appreciation for the period relating to those Level III assets that were still held by the Company at the end of the period: (8,151) (5,819) (27,328) (6,481)
First lien | Income Statement Location [Axis]: us-gaap:DebtAndEquitySecuritiesRealizedGainLoss        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gains or losses included in earnings: (12,497) 30 (39,858) 97
First lien | Income Statement Location [Axis]: us-gaap:DebtAndEquitySecuritiesUnrealizedGainLoss        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gains or losses included in earnings: 3,487 (5,909) (18,321) (6,620)
Second lien        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 73,098 125,004 91,179 150,334
Purchases, including capitalized PIK and revolver fundings 663 0 2,869 4,255
Proceeds from sales and paydowns of investments (6,373) (4,386) (6,373) (31,613)
Transfers into Level III 6,150 9,196 6,150 9,208
Transfers out of Level III 0   (15,284)  
Ending balance 72,991 128,623 72,991 128,623
Net change in unrealized (depreciation) appreciation for the period relating to those Level III assets that were still held by the Company at the end of the period: (463) (690) (8,143) (1,117)
Second lien | Income Statement Location [Axis]: us-gaap:DebtAndEquitySecuritiesRealizedGainLoss        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gains or losses included in earnings: (7,956) (501) (7,956) (2,732)
Second lien | Income Statement Location [Axis]: us-gaap:DebtAndEquitySecuritiesUnrealizedGainLoss        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gains or losses included in earnings: 7,409 (690) 2,406 (829)
Subordinated        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 93,449 104,948 121,487 102,034
Purchases, including capitalized PIK and revolver fundings 7,738 3,026 11,046 5,777
Proceeds from sales and paydowns of investments 0 0 (25,313) 0
Transfers into Level III 0 0 0 0
Transfers out of Level III (2,755)   (2,755)  
Ending balance 98,429 107,986 98,429 107,986
Net change in unrealized (depreciation) appreciation for the period relating to those Level III assets that were still held by the Company at the end of the period: (3) 10 (176) 173
Subordinated | Income Statement Location [Axis]: us-gaap:DebtAndEquitySecuritiesRealizedGainLoss        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gains or losses included in earnings: 0 0 (2,089) 0
Subordinated | Income Statement Location [Axis]: us-gaap:DebtAndEquitySecuritiesUnrealizedGainLoss        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gains or losses included in earnings: (3) 12 (3,947) 175
Structured Finance Obligations        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 3,186 3,232 3,277 0
Purchases, including capitalized PIK and revolver fundings 0 0 0 0
Proceeds from sales and paydowns of investments 0 0 0 0
Transfers into Level III 0 0 0 3,232
Transfers out of Level III 0   0  
Ending balance 3,191 3,249 3,191 3,249
Net change in unrealized (depreciation) appreciation for the period relating to those Level III assets that were still held by the Company at the end of the period: 4 17 (86) 17
Structured Finance Obligations | Income Statement Location [Axis]: us-gaap:DebtAndEquitySecuritiesRealizedGainLoss        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gains or losses included in earnings: 0 0 0 0
Structured Finance Obligations | Income Statement Location [Axis]: us-gaap:DebtAndEquitySecuritiesUnrealizedGainLoss        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gains or losses included in earnings: 5 17 (86) 17
Equity and other        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 637,198 793,395 707,855 832,100
Purchases, including capitalized PIK and revolver fundings 22,495 6,065 36,984 76,878
Proceeds from sales and paydowns of investments (5,095) (32,367) (82,540) (134,622)
Transfers into Level III 2,755 0 2,755 0
Transfers out of Level III 0   0  
Ending balance 660,250 753,039 660,250 753,039
Net change in unrealized (depreciation) appreciation for the period relating to those Level III assets that were still held by the Company at the end of the period: 3,336 (15,893) (6,547) (22,520)
Equity and other | Income Statement Location [Axis]: us-gaap:DebtAndEquitySecuritiesRealizedGainLoss        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gains or losses included in earnings: (24,489) 13,876 (25,729) 53,706
Equity and other | Income Statement Location [Axis]: us-gaap:DebtAndEquitySecuritiesUnrealizedGainLoss        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gains or losses included in earnings: $ 27,386 $ (27,930) $ 20,925 $ (75,023)