v3.26.3
Fair Value of Financial Instruments - Schedule of Net Change in Unrealized Gains on Investments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net change in unrealized gain (loss) $ 68,419 $ 103,163 $ (396,501) $ 164,588
First-lien senior secured debt investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net change in unrealized gain (loss) 36,940 2,150 (164,103) 21,436
First-lien senior secured debt investments | Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net change in unrealized gain (loss) 6 3,801 (15,439) 7,329
First-lien senior secured debt investments | Income Statement Location [Axis]: us-gaap:UnrealizedGainLossInvestmentDerivativeAndForeignCurrencyTransactionOperatingAfterTax        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net change in unrealized gain (loss) 38,438 (4,125) (156,782) 18,213
Second-lien senior secured debt investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net change in unrealized gain (loss) (1,634) 1,817 (58,419) 1,371
Second-lien senior secured debt investments | Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net change in unrealized gain (loss) 0 0 0 (12,198)
Second-lien senior secured debt investments | Income Statement Location [Axis]: us-gaap:UnrealizedGainLossInvestmentDerivativeAndForeignCurrencyTransactionOperatingAfterTax        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net change in unrealized gain (loss) 4,889 1,817 (61,652) 10,317
Unsecured debt investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net change in unrealized gain (loss) (204) (1,293) (5,431) 10,037
Unsecured debt investments | Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net change in unrealized gain (loss) 0 0 2,335 85
Unsecured debt investments | Income Statement Location [Axis]: us-gaap:UnrealizedGainLossInvestmentDerivativeAndForeignCurrencyTransactionOperatingAfterTax        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net change in unrealized gain (loss) (204) (1,293) (5,431) 10,580
Specialty finance debt investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net change in unrealized gain (loss) 1 1 2 (16)
Specialty finance debt investments | Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net change in unrealized gain (loss) 0 0 0 0
Specialty finance debt investments | Income Statement Location [Axis]: us-gaap:UnrealizedGainLossInvestmentDerivativeAndForeignCurrencyTransactionOperatingAfterTax        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net change in unrealized gain (loss) 1 1 2 (16)
Preferred equity investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net change in unrealized gain (loss) 13,388 63,880 (133,570) 76,867
Preferred equity investments | Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net change in unrealized gain (loss) 0 149 (10,549) 264
Preferred equity investments | Income Statement Location [Axis]: us-gaap:UnrealizedGainLossInvestmentDerivativeAndForeignCurrencyTransactionOperatingAfterTax        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net change in unrealized gain (loss) 26,967 63,880 (122,310) 76,867
Common equity investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net change in unrealized gain (loss) 21,150 32,916 (32,858) 47,998
Common equity investments | Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net change in unrealized gain (loss) 6,978 (2,306) 119,055 (2,306)
Common equity investments | Income Statement Location [Axis]: us-gaap:UnrealizedGainLossInvestmentDerivativeAndForeignCurrencyTransactionOperatingAfterTax        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net change in unrealized gain (loss) 20,884 36,159 (189,288) 51,074
Specialty finance equity investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net change in unrealized gain (loss) (1,222) 3,692 (2,122) 6,895
Specialty finance equity investments | Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net change in unrealized gain (loss) 0 0 0 0
Specialty finance equity investments | Income Statement Location [Axis]: us-gaap:UnrealizedGainLossInvestmentDerivativeAndForeignCurrencyTransactionOperatingAfterTax        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net change in unrealized gain (loss) $ (1,222) $ 3,692 $ (2,122) $ 6,895