v3.26.3
Fair Value - Schedule of Changes in Fair Value of Level III Portfolio Investments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Total        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 2,229,035 $ 2,920,263 $ 2,698,434 $ 2,987,078
Purchases, including capitalized PIK and revolver fundings 35,603 139,332 264,176 470,593
Proceeds from sales and paydowns of investments (46,767) (163,342) (679,063) (550,437)
Transfers into Level III   20,231 27,018 29,666
Transfers out of Level III   (54,257) (18,039) (46,430)
Ending balance 2,203,472 2,842,734 2,203,472 2,842,734
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: (14,486) (37,652) (56,931) (53,505)
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: 78 11 (75,554) 51,087
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: (14,477) (19,504) (13,500) (98,823)
First lien        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 1,394,174 1,927,366 1,774,636 1,902,610
Purchases, including capitalized PIK and revolver fundings 27,678 121,173 205,352 365,524
Proceeds from sales and paydowns of investments (40,457) (98,831) (558,527) (319,690)
Transfers into Level III   0 18,113 0
Transfers out of Level III   (54,257) 0 (46,430)
Ending balance 1,374,415 1,888,377 1,374,415 1,888,377
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: (7,070) (7,387) (34,545) (13,964)
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: 80 3 (39,778) 101
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: (7,060) (7,077) (25,381) (13,738)
Second lien        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 72,991 128,623 91,179 150,334
Purchases, including capitalized PIK and revolver fundings 679 9,464 3,548 13,719
Proceeds from sales and paydowns of investments (3,024) (62,656) (9,397) (94,270)
Transfers into Level III   20,231 6,150 26,434
Transfers out of Level III   0 (15,284) 0
Ending balance 68,064 98,128 68,064 98,128
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: (2,581) 2,498 (10,741) 4,386
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: 0 (33) (7,956) (2,762)
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: (2,582) 2,499 (176) 4,673
Subordinated        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 98,429 107,986 121,487 102,034
Purchases, including capitalized PIK and revolver fundings 3,322 3,187 14,368 8,965
Proceeds from sales and paydowns of investments 0 0 (25,313) 0
Transfers into Level III   0 0 0
Transfers out of Level III   0 (2,755) 0
Ending balance 101,722 111,031 101,722 111,031
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: (29) (143) (205) 30
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: (29) (142) (3,976) 32
Structured Finance Obligations        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 3,191 3,249 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 3,232
Transfers out of Level III   0 0 0
Ending balance 3,217 3,257 3,217 3,257
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: 27 8 (60) 25
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: 26 8 (60) 25
Equity and other        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 660,250 753,039 707,855 832,100
Purchases, including capitalized PIK and revolver fundings 3,924 5,508 40,908 82,385
Proceeds from sales and paydowns of investments (3,286) (1,855) (85,826) (136,477)
Transfers into Level III   0 2,755 0
Transfers out of Level III   0 0 0
Ending balance 656,054 741,941 656,054 741,941
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: (4,833) (32,628) (11,380) (43,982)
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: (2) 41 (25,731) 53,748
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: $ (4,832) $ (14,792) $ 16,093 $ (89,815)