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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, 2025
Mar. 31, 2024
Total    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 1,799,726 $ 1,814,161
Investments purchased 98,284 153,023
Accretion of discount 1,796 11,665
Sales and principal repayments (66,310) (238,664)
Net transfers in and/or (out) of Level 3 (956)  
Ending balance 1,770,543 1,719,718
Change in net unrealized depreciation appreciation on investments (64,089) (12,629)
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 2,294 (9,736)
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 (64,291) (10,731)
Senior Secured First Lien Debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 1,563,256 1,565,171
Investments purchased 90,437 128,110
Accretion of discount 1,792 11,573
Sales and principal repayments (66,310) (223,684)
Net transfers in and/or (out) of Level 3 0  
Ending balance 1,556,067 1,465,051
Change in net unrealized depreciation appreciation on investments (35,731) (3,822)
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 2,825 (2,011)
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 (35,933) (14,108)
Senior Secured Second Lien Debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 2,680 29,111
Investments purchased 69 60
Accretion of discount 4 53
Sales and principal repayments 0 (1,481)
Net transfers in and/or (out) of Level 3 0  
Ending balance 2,593 28,460
Change in net unrealized depreciation appreciation on investments (160) 714
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 0 (11,809)
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 (160) 12,526
Collateralized securities and structured products - equity    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 2,682 1,096
Investments purchased 979 0
Accretion of discount 0 0
Sales and principal repayments 0 (64)
Net transfers in and/or (out) of Level 3 0  
Ending balance 3,612 1,004
Change in net unrealized depreciation appreciation on investments (49) (15)
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 0 (1,210)
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 (49) 1,182
Unsecured debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 11,814 12,874
Investments purchased 44 1,421
Accretion of discount 0 39
Sales and principal repayments 0 (8,872)
Net transfers in and/or (out) of Level 3 0  
Ending balance 12,278 5,506
Change in net unrealized depreciation appreciation on investments 420 (50)
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 420 44
Equity    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 219,294 205,909
Investments purchased 6,755 23,432
Accretion of discount 0 0
Sales and principal repayments 0 (4,563)
Net transfers in and/or (out) of Level 3 (956)  
Ending balance 195,993 219,697
Change in net unrealized depreciation appreciation on investments (28,569) (9,456)
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 (531) 5,294
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 $ (28,569) $ (10,375)