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Fair Value of Financial Instruments - Changes in Level 3 Portfolio Investments Rollforward (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Total    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 1,632,922 $ 1,468,282
Investments purchased 608,596 920,114
Accretion of discount 11,032 11,737
Sales and principal repayments (498,527) (802,666)
Ending balance 1,716,054 1,632,922
Change in net unrealized (depreciation) appreciation on investments still held (45,670) 17,553
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 (32,747) 3,878
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 (5,222) 31,577
Senior Secured First Lien Debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 1,526,989 1,223,268
Investments purchased 549,950 889,038
Accretion of discount 10,517 10,940
Sales and principal repayments (480,717) (601,441)
Ending balance 1,579,512 1,526,989
Change in net unrealized (depreciation) appreciation on investments still held (39,831) 2,341
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 (5,646) (210)
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 (21,581) 5,394
Senior Secured Second Lien Debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 38,583 151,506
Investments purchased 19,930 1,885
Accretion of discount 500 783
Sales and principal repayments (15,521) (115,761)
Ending balance 38,769 38,583
Change in net unrealized (depreciation) appreciation on investments still held 801 (1,621)
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 (19,327) (2,932)
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 14,604 3,102
Collateralized Securities and Structured Products - Equity    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 2,998 12,131
Investments purchased 0 0
Accretion of discount 0 0
Sales and principal repayments (1,222) (12,090)
Ending balance 1,179 2,998
Change in net unrealized (depreciation) appreciation on investments still held (621) 1,152
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 24 670
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 (621) 2,287
Unsecured debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 26,616 5,464
Investments purchased 3,635 21,095
Accretion of discount 15 14
Sales and principal repayments 0 0
Ending balance 22,643 26,616
Change in net unrealized (depreciation) appreciation on investments still held (7,623) 43
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 (7,623) 43
Equity    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 37,736 75,913
Investments purchased 35,081 8,096
Accretion of discount 0 0
Sales and principal repayments (1,067) (73,374)
Ending balance 73,951 37,736
Change in net unrealized (depreciation) appreciation on investments still held 1,604 15,638
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 (7,798) 6,350
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 $ 9,999 $ 20,751