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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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Total        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 1,719,718 $ 1,629,058 $ 1,814,161 $ 1,716,054
Investments purchased 168,072 111,557 321,095 188,242
Accretion of discount 1,633 2,601 13,298 6,943
Sales and principal repayments (86,861) (87,971) (325,525) (200,231)
Ending balance 1,803,700 1,660,246 1,803,700 1,660,246
Change in net unrealized (depreciation) appreciation on investments 11,220 6,732 (2,432) (31,031)
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 (20,277) (18,928) (30,013) (23,453)
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 21,415 23,929 10,684 (27,309)
Senior Secured First Lien Debt        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 1,465,051 1,472,453 1,565,171 1,579,512
Investments purchased 147,863 77,961 275,973 118,713
Accretion of discount 961 2,541 12,534 6,810
Sales and principal repayments (71,805) (87,870) (295,489) (200,045)
Ending balance 1,536,753 1,468,630 1,536,753 1,468,630
Change in net unrealized (depreciation) appreciation on investments (167) 5,280 (3,988) (22,169)
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 (18,406) (13,163) (20,417) (17,674)
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 13,089 16,708 (1,019) (18,686)
Senior Secured Second Lien Debt        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 28,460 38,997 29,111 38,769
Investments purchased 129 0 189 0
Accretion of discount 672 56 725 125
Sales and principal repayments (12,504) (5) (13,985) (9)
Ending balance 15,050 39,544 15,050 39,544
Change in net unrealized (depreciation) appreciation on investments (665) 496 (975) 659
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 (1,707) 496 10,819 659
Collateralized securities and structured products - equity        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 1,004 1,133 1,096 1,179
Investments purchased 0 0 0 0
Accretion of discount 0 0 0 0
Sales and principal repayments (64) (96) (128) (177)
Ending balance 770 1,046 770 1,046
Change in net unrealized (depreciation) appreciation on investments (170) 9 (186) 44
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 (170) 9 1,012 44
Unsecured debt        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 5,506 15,517 12,874 22,643
Investments purchased 33 4,200 1,454 4,200
Accretion of discount 0 4 39 8
Sales and principal repayments 0 0 (8,872) 0
Ending balance 5,493 17,301 5,493 17,301
Change in net unrealized (depreciation) appreciation on investments (46) (2,420) (96) (9,550)
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 (46) (2,420) (2) (9,550)
Equity        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 219,697 100,958 205,909 73,951
Investments purchased 20,047 29,396 43,479 65,329
Accretion of discount 0 0 0 0
Sales and principal repayments (2,488) 0 (7,051) 0
Ending balance 245,634 133,725 245,634 133,725
Change in net unrealized (depreciation) appreciation on investments 12,268 3,367 2,813 (15)
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 (1,871) (5,765) 3,423 (5,779)
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 $ 10,249 $ 9,136 $ (126) $ 224