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Fair Value Measures and Disclosures - Changes in Level 3 Portfolio Investments Rollforward (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 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 76,685 143,540
Accretion of discount 4,342 2,496
Sales and principal repayments (112,260) (61,032)
Ending balance 1,629,058 1,706,556
Change in net unrealized (depreciation) appreciation on investments still held (50,516) (11,105)
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 (4,525) (69)
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 (51,238) (11,301)
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 40,752 141,792
Accretion of discount 4,269 2,404
Sales and principal repayments (112,175) (60,842)
Ending balance 1,472,453 1,597,364
Change in net unrealized (depreciation) appreciation on investments still held (34,672) (12,710)
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 (4,511) (73)
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 (35,394) (12,906)
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 0 0
Accretion of discount 69 88
Sales and principal repayments (4) 0
Ending balance 38,997 36,875
Change in net unrealized (depreciation) appreciation on investments still held 163 (1,800)
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 4
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 163 (1,800)
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 (81) (190)
Ending balance 1,133 2,632
Change in net unrealized (depreciation) appreciation on investments still held 35 (176)
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 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 35 (176)
Unsecured debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 22,643 26,616
Investments purchased 0 623
Accretion of discount 4 4
Sales and principal repayments 0 0
Ending balance 15,517 27,280
Change in net unrealized (depreciation) appreciation on investments still held (7,130) 37
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 (7,130) 37
Equity    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 73,951 37,736
Investments purchased 35,933 1,125
Accretion of discount 0 0
Sales and principal repayments 0 0
Ending balance 100,958 42,405
Change in net unrealized (depreciation) appreciation on investments still held (8,912) 3,544
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 (14) 0
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 $ (8,912) $ 3,544