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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, 2023
Dec. 31, 2022
Total    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 1,716,054 $ 1,632,922
Investments purchased 510,571 608,596
Accretion of discount 13,506 11,032
Sales and principal repayments (422,707) (498,527)
Ending balance 1,814,161 1,716,054
Change in net unrealized (depreciation) appreciation on investments still held 11,055 (45,670)
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 (31,927) (32,747)
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 28,664 (5,222)
Senior Secured First Lien Debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 1,579,512 1,526,989
Investments purchased 393,865 549,950
Accretion of discount 13,285 10,517
Sales and principal repayments (417,773) (480,717)
Ending balance 1,565,171 1,579,512
Change in net unrealized (depreciation) appreciation on investments still held 5,416 (39,831)
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 (24,261) (5,646)
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 20,543 (21,581)
Senior Secured Second Lien Debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 38,769 38,583
Investments purchased 57 19,930
Accretion of discount 204 500
Sales and principal repayments (18) (15,521)
Ending balance 29,111 38,769
Change in net unrealized (depreciation) appreciation on investments still held (9,901) 801
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 (19,327)
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 (9,901) 14,604
Collateralized securities and structured products - equity    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 1,179 2,998
Investments purchased 0 0
Accretion of discount 0 0
Sales and principal repayments (325) (1,222)
Ending balance 1,096 1,179
Change in net unrealized (depreciation) appreciation on investments still held 242 (621)
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 24
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 242 (621)
Unsecured debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 22,643 26,616
Investments purchased 5,449 3,635
Accretion of discount 17 15
Sales and principal repayments (4,200) 0
Ending balance 12,874 22,643
Change in net unrealized (depreciation) appreciation on investments still held (11,035) (7,623)
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 (11,035) (7,623)
Equity    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 73,951 37,736
Investments purchased 111,200 35,081
Accretion of discount 0 0
Sales and principal repayments (391) (1,067)
Ending balance 205,909 73,951
Change in net unrealized (depreciation) appreciation on investments still held 26,333 1,604
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 (7,666) (7,798)
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 $ 28,815 $ 9,999