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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Total        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 1,803,700 $ 1,660,246 $ 1,814,161 $ 1,716,054
Investments purchased 138,850 146,798 459,945 335,040
Accretion of discount 1,864 3,899 15,162 10,842
Sales and principal repayments (188,950) (127,928) (514,475) (328,159)
Ending balance 1,732,364 1,701,036 1,732,364 1,701,036
Change in net unrealized (depreciation) appreciation on investments (22,540) 5,013 (24,924) (13,507)
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 3,938 (8,123) (26,075) (31,576)
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 (27,038) 26,144 (16,354) (1,165)
Senior Secured First Lien Debt        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 1,536,753 1,468,630 1,565,171 1,579,512
Investments purchased 122,203 112,470 398,176 231,183
Accretion of discount 1,781 3,847 14,315 10,657
Sales and principal repayments (157,768) (127,838) (453,257) (327,883)
Ending balance 1,494,524 1,481,498 1,494,524 1,481,498
Change in net unrealized (depreciation) appreciation on investments (6,228) 10,453 (10,575) 1,685
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 (1,792) (5,844) (22,209) (23,518)
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 (6,653) 30,233 (7,672) 11,547
Senior Secured Second Lien Debt        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 15,050 39,544 29,111 38,769
Investments purchased 134 0 323 0
Accretion of discount 83 47 808 172
Sales and principal repayments (11,501) (4) (25,486) (13)
Ending balance 3,873 36,114 3,873 36,114
Change in net unrealized (depreciation) appreciation on investments 174 (3,473) (856) (2,814)
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 0 (11,809) 0
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 107 (3,473) 10,926 (2,814)
Collateralized securities and structured products - equity        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 770 1,046 1,096 1,179
Investments purchased 0 0 0 0
Accretion of discount 0 0 0 0
Sales and principal repayments (21) (86) (149) (263)
Ending balance 685 1,224 685 1,224
Change in net unrealized (depreciation) appreciation on investments (64) 264 (249) 308
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 (1,210) 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 (64) 264 948 308
Unsecured debt        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 5,493 17,301 12,874 22,643
Investments purchased 5,187 0 6,641 4,200
Accretion of discount 0 5 39 13
Sales and principal repayments 0 0 (8,872) 0
Ending balance 11,761 14,631 11,761 14,631
Change in net unrealized (depreciation) appreciation on investments 1,081 (2,675) 985 (12,225)
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 1,081 (2,675) 1,079 (12,225)
Equity        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 245,634 133,725 205,909 73,951
Investments purchased 11,326 34,328 54,805 99,657
Accretion of discount 0 0 0 0
Sales and principal repayments (19,660) 0 (26,711) 0
Ending balance 221,521 167,569 221,521 167,569
Change in net unrealized (depreciation) appreciation on investments (17,503) 444 (14,229) (461)
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 5,730 (2,279) 9,153 (8,058)
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 $ (21,509) $ 1,795 $ (21,635) $ 2,019