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Fair Value of Financial Instruments - Schedule of Changes in Level 3 Portfolio Investments Rollforward (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Total    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 1,814,161 $ 1,716,054
Investments purchased 590,620 510,571
Accretion of discount 16,773 13,506
Sales and principal repayments (566,389) (422,707)
Ending balance 1,799,726 1,814,161
Changes in net unrealized appreciation (depreciation) on investments (36,026) 11,055
Total | Debt and Equity Securities, Realized Gain (Loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains or losses included in earnings (28,313) (31,927)
Total | Debt and Equity Securities, Unrealized Gain (Loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains or losses included in earnings (27,126) 28,664
Senior Secured First Lien Debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 1,565,171 1,579,512
Investments purchased 520,073 393,865
Accretion of discount 15,925 13,285
Sales and principal repayments (504,464) (417,773)
Ending balance 1,563,256 1,565,171
Changes in net unrealized appreciation (depreciation) on investments (11,576) 5,416
Senior Secured First Lien Debt | Debt and Equity Securities, Realized Gain (Loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains or losses included in earnings (25,105) (24,261)
Senior Secured First Lien Debt | Debt and Equity Securities, Unrealized Gain (Loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains or losses included in earnings (8,344) 20,543
Senior Secured Second Lien Debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 29,111 38,769
Investments purchased 393 57
Accretion of discount 809 204
Sales and principal repayments (25,486) (18)
Ending balance 2,680 29,111
Changes in net unrealized appreciation (depreciation) on investments (2,120) (9,901)
Senior Secured Second Lien Debt | Debt and Equity Securities, Realized Gain (Loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains or losses included in earnings (11,809) 0
Senior Secured Second Lien Debt | Debt and Equity Securities, Unrealized Gain (Loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains or losses included in earnings 9,662 (9,901)
Collateralized securities and structured products - equity    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 1,096 1,179
Investments purchased 2,002 0
Accretion of discount 0 0
Sales and principal repayments (174) (325)
Ending balance 2,682 1,096
Changes in net unrealized appreciation (depreciation) on investments (229) 242
Collateralized securities and structured products - equity | Debt and Equity Securities, Realized Gain (Loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains or losses included in earnings (1,210) 0
Collateralized securities and structured products - equity | Debt and Equity Securities, Unrealized Gain (Loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains or losses included in earnings 968 242
Unsecured debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 12,874 22,643
Investments purchased 6,682 5,449
Accretion of discount 39 17
Sales and principal repayments (8,927) (4,200)
Ending balance 11,814 12,874
Changes in net unrealized appreciation (depreciation) on investments 1,052 (11,035)
Unsecured debt | Debt and Equity Securities, Realized Gain (Loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains or losses included in earnings 0 0
Unsecured debt | Debt and Equity Securities, Unrealized Gain (Loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains or losses included in earnings 1,146 (11,035)
Equity    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 205,909 73,951
Investments purchased 61,470 111,200
Accretion of discount 0 0
Sales and principal repayments (27,338) (391)
Ending balance 219,294 205,909
Changes in net unrealized appreciation (depreciation) on investments (23,153) 26,333
Equity | Debt and Equity Securities, Realized Gain (Loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains or losses included in earnings 9,811 (7,666)
Equity | Debt and Equity Securities, Unrealized Gain (Loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains or losses included in earnings $ (30,558) $ 28,815