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Fair Value of Financial Instruments - Schedule of Changes in Level 3 Portfolio Investments Rollforward (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 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 153,023 76,685
Accretion of discount 11,665 4,342
Sales and principal repayments (238,664) (112,260)
Ending balance 1,719,718 1,629,058
Change in net unrealized (depreciation) appreciation on investments (12,629) (50,516)
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 (9,736) (4,525)
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 (10,731) (51,238)
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 128,110 40,752
Accretion of discount 11,573 4,269
Sales and principal repayments (223,684) (112,175)
Ending balance 1,465,051 1,472,453
Change in net unrealized (depreciation) appreciation on investments (3,822) (34,672)
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 (2,011) (4,511)
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 (14,108) (35,394)
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 60 0
Accretion of discount 53 69
Sales and principal repayments (1,481) (4)
Ending balance 28,460 38,997
Change in net unrealized (depreciation) appreciation on investments 714 163
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 12,526 163
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 0 0
Accretion of discount 0 0
Sales and principal repayments (64) (81)
Ending balance 1,004 1,133
Change in net unrealized (depreciation) appreciation on investments (15) 35
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 1,182 35
Unsecured debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 12,874 22,643
Investments purchased 1,421 0
Accretion of discount 39 4
Sales and principal repayments (8,872) 0
Ending balance 5,506 15,517
Change in net unrealized (depreciation) appreciation on investments (50) (7,130)
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 44 (7,130)
Equity    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 205,909 73,951
Investments purchased 23,432 35,933
Accretion of discount 0 0
Sales and principal repayments (4,563) 0
Ending balance 219,697 100,958
Change in net unrealized (depreciation) appreciation on investments (9,456) (8,912)
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 5,294 (14)
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 $ (10,375) $ (8,912)