v3.26.1
Fair Value of Investments - Schedule of Changes in the Fair Value of 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]        
Fair value, beginning of period $ 4,578,924 $ 4,231,626 $ 5,295,125 $ 4,010,081
Purchases of investments, net 85,688 499,690 137,615 927,999
Payment-in-kind 13,932 13,989 23,977 22,408
Proceeds from investments, net (190,652) (138,699) (832,173) (398,494)
Net accretion/amortization of discount/premium on investments 2,622 3,728 5,949 9,493
Transfers into (out of) Level 3 7,863 (110,748) (34,047) (73,423)
Fair Value, End of Period 4,493,155 4,511,770 4,493,155 4,511,770
Total | Income Statement Location [Axis]: us-gaap:RealizedGainLossInvestmentDerivativeAndForeignCurrencyTransactionPriceChangeOperatingBeforeTax        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net change in unrealized gain (loss) / realized gains (losses) 13,236 1,567 14,105 1,831
Total | Income Statement Location [Axis]: us-gaap:UnrealizedGainLossInvestmentDerivativeAndForeignCurrencyTransactionPriceChangeOperatingBeforeTax        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net change in unrealized gain (loss) / realized gains (losses) (18,458) 10,617 (117,396) 11,875
First-lien senior secured debt investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value, beginning of period 4,142,341 3,830,095 4,802,901 3,601,677
Purchases of investments, net 84,466 428,468 129,530 848,024
Payment-in-kind 5,376 4,103 10,808 6,875
Proceeds from investments, net (164,093) (77,554) (799,749) (311,437)
Net accretion/amortization of discount/premium on investments 2,513 3,013 5,709 8,224
Transfers into (out of) Level 3 (11,109) (98,310) (16,120) (65,694)
Fair Value, End of Period 4,057,524 4,099,772 4,057,524 4,099,772
First-lien senior secured debt investments | Income Statement Location [Axis]: us-gaap:RealizedGainLossInvestmentDerivativeAndForeignCurrencyTransactionPriceChangeOperatingBeforeTax        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net change in unrealized gain (loss) / realized gains (losses) 2,423 1,536 3,263 1,543
First-lien senior secured debt investments | Income Statement Location [Axis]: us-gaap:UnrealizedGainLossInvestmentDerivativeAndForeignCurrencyTransactionPriceChangeOperatingBeforeTax        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net change in unrealized gain (loss) / realized gains (losses) (4,393) 8,421 (78,818) 10,560
Second-lien senior secured debt investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value, beginning of period 117,845 135,061 161,254 122,347
Purchases of investments, net 0 56,928 33 56,928
Payment-in-kind 1,149 3,004 2,290 5,117
Proceeds from investments, net 0 (57,609) 0 (57,609)
Net accretion/amortization of discount/premium on investments 49 559 70 621
Transfers into (out of) Level 3 18,972 (12,438) (17,927) 0
Fair Value, End of Period 131,763 123,282 131,763 123,282
Second-lien senior secured debt investments | Income Statement Location [Axis]: us-gaap:RealizedGainLossInvestmentDerivativeAndForeignCurrencyTransactionPriceChangeOperatingBeforeTax        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net change in unrealized gain (loss) / realized gains (losses) 0 0 0 0
Second-lien senior secured debt investments | Income Statement Location [Axis]: us-gaap:UnrealizedGainLossInvestmentDerivativeAndForeignCurrencyTransactionPriceChangeOperatingBeforeTax        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net change in unrealized gain (loss) / realized gains (losses) (6,252) (2,223) (13,957) (4,122)
Unsecured debt investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value, beginning of period 62,454 60,284 66,531 59,333
Purchases of investments, net 0 0 0 0
Payment-in-kind 972 995 2,003 1,945
Proceeds from investments, net 0 0 (4,780) 0
Net accretion/amortization of discount/premium on investments 7 6 13 12
Transfers into (out of) Level 3 0 0 0 0
Fair Value, End of Period 63,452 61,279 63,452 61,279
Unsecured debt investments | Income Statement Location [Axis]: us-gaap:RealizedGainLossInvestmentDerivativeAndForeignCurrencyTransactionPriceChangeOperatingBeforeTax        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net change in unrealized gain (loss) / realized gains (losses) 0 0 29 0
Unsecured debt investments | Income Statement Location [Axis]: us-gaap:UnrealizedGainLossInvestmentDerivativeAndForeignCurrencyTransactionPriceChangeOperatingBeforeTax        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net change in unrealized gain (loss) / realized gains (losses) 19 (6) (344) (11)
Preferred equity investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value, beginning of period 171,367 148,221 173,230 171,478
Purchases of investments, net 0 13,390 4,000 13,390
Payment-in-kind 6,435 5,887 8,876 8,471
Proceeds from investments, net (96) (3,142) (1,181) (29,054)
Net accretion/amortization of discount/premium on investments 53 150 157 636
Transfers into (out of) Level 3 0 0 0 0
Fair Value, End of Period 164,403 166,761 164,403 166,761
Preferred equity investments | Income Statement Location [Axis]: us-gaap:RealizedGainLossInvestmentDerivativeAndForeignCurrencyTransactionPriceChangeOperatingBeforeTax        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net change in unrealized gain (loss) / realized gains (losses) 96 31 96 288
Preferred equity investments | Income Statement Location [Axis]: us-gaap:UnrealizedGainLossInvestmentDerivativeAndForeignCurrencyTransactionPriceChangeOperatingBeforeTax        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net change in unrealized gain (loss) / realized gains (losses) (13,452) 2,224 (20,775) 1,552
Common equity investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value, beginning of period 82,255 54,917 88,586 52,144
Purchases of investments, net 1,222 904 4,052 9,657
Payment-in-kind 0 0 0 0
Proceeds from investments, net (25,877) 0 (25,877) 0
Net accretion/amortization of discount/premium on investments 0 0 0 0
Transfers into (out of) Level 3 0 0 0 (7,729)
Fair Value, End of Period 73,949 58,231 73,949 58,231
Common equity investments | Income Statement Location [Axis]: us-gaap:RealizedGainLossInvestmentDerivativeAndForeignCurrencyTransactionPriceChangeOperatingBeforeTax        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net change in unrealized gain (loss) / realized gains (losses) 10,717 0 10,717 0
Common equity investments | Income Statement Location [Axis]: us-gaap:UnrealizedGainLossInvestmentDerivativeAndForeignCurrencyTransactionPriceChangeOperatingBeforeTax        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net change in unrealized gain (loss) / realized gains (losses) 5,632 2,410 (3,529) 4,159
Specialty finance equity investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value, beginning of period 2,662 3,048 2,623 3,102
Purchases of investments, net 0 0 0 0
Payment-in-kind 0 0 0 0
Proceeds from investments, net (586) (394) (586) (394)
Net accretion/amortization of discount/premium on investments 0 0 0 0
Transfers into (out of) Level 3 0 0 0 0
Fair Value, End of Period 2,064 2,445 2,064 2,445
Specialty finance equity investments | Income Statement Location [Axis]: us-gaap:RealizedGainLossInvestmentDerivativeAndForeignCurrencyTransactionPriceChangeOperatingBeforeTax        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net change in unrealized gain (loss) / realized gains (losses) 0 0 0 0
Specialty finance equity investments | Income Statement Location [Axis]: us-gaap:UnrealizedGainLossInvestmentDerivativeAndForeignCurrencyTransactionPriceChangeOperatingBeforeTax        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net change in unrealized gain (loss) / realized gains (losses) $ (12) $ (209) $ 27 $ (263)