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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 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Total        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 1,743,513 $ 1,803,700 $ 1,799,726 $ 1,814,161
Investments purchased 180,866 138,850 358,815 459,945
Accretion of discount 19,445 1,864 23,654 15,162
Sales and principal repayments (225,392) (188,950) (409,902) (514,475)
Net transfers in and/or (out) of Level 3 (4,555)   (5,511)  
Ending balance 1,714,838 1,732,364 1,714,838 1,732,364
Change in net unrealized (depreciation) appreciation on investments still held as of September 30, 2025 21,252 (22,540) (2,600) (24,924)
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 (9,605) 3,938 (39,687) (26,075)
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 10,566 (27,038) (12,257) (16,354)
Senior Secured First Lien Debt        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 1,501,896 1,536,753 1,563,256 1,565,171
Investments purchased 128,458 122,203 293,866 398,176
Accretion of discount 19,404 1,781 23,602 14,315
Sales and principal repayments (225,332) (157,768) (405,227) (453,257)
Net transfers in and/or (out) of Level 3 0   0  
Ending balance 1,389,814 1,494,524 1,389,814 1,494,524
Change in net unrealized (depreciation) appreciation on investments still held as of September 30, 2025 (14,931) (6,228) (38,917) (10,575)
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 (5,965) (1,792) (35,516) (22,209)
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 (28,647) (6,653) (50,167) (7,672)
Senior Secured Second Lien Debt        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 1,011 15,050 2,680 29,111
Investments purchased 70 134 214 323
Accretion of discount 41 83 52 808
Sales and principal repayments (35) (11,501) (35) (25,486)
Net transfers in and/or (out) of Level 3 0   0  
Ending balance 0 3,873 0 3,873
Change in net unrealized (depreciation) appreciation on investments still held as of September 30, 2025 (892) 174 (1,507) (856)
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 (3,200) 0 (3,200) (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 2,113 107 289 10,926
Collateralized securities and structured products - equity        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 3,027 770 2,682 1,096
Investments purchased 985 0 1,964 0
Accretion of discount 0 0 0 0
Sales and principal repayments (25) (21) (537) (149)
Net transfers in and/or (out) of Level 3 0   0  
Ending balance 4,009 685 4,009 685
Change in net unrealized (depreciation) appreciation on investments still held as of September 30, 2025 462 (64) 340 (249)
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 (440) 0 (440) (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 462 (64) 340 948
Unsecured debt        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 8,091 5,493 11,814 12,874
Investments purchased 45 5,187 132 6,641
Accretion of discount 0 0 0 39
Sales and principal repayments 0 0 (4,103) (8,872)
Net transfers in and/or (out) of Level 3 0   0  
Ending balance 7,398 11,761 7,398 11,761
Change in net unrealized (depreciation) appreciation on investments still held as of September 30, 2025 (738) 1,081 (445) 985
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 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 (738) 1,081 (445) 1,079
Equity        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 229,488 245,634 219,294 205,909
Investments purchased 51,308 11,326 62,639 54,805
Accretion of discount 0 0 0 0
Sales and principal repayments 0 (19,660) 0 (26,711)
Net transfers in and/or (out) of Level 3 (4,555)   (5,511)  
Ending balance 313,617 221,521 313,617 221,521
Change in net unrealized (depreciation) appreciation on investments still held as of September 30, 2025 37,351 (17,503) 37,929 (14,229)
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 5,730 (531) 9,153
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 $ 37,376 $ (21,509) $ 37,726 $ (21,635)