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Fair Value of Financial Instruments - Schedule of Changes in Level 3 Portfolio Investments Rollforward (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Total |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | $ 1,814,161 | $ 1,716,054
Investments purchased | 590,620 | 510,571
Accretion of discount | 16,773 | 13,506
Sales and principal repayments | (566,389) | (422,707)
Ending balance | 1,799,726 | 1,814,161
Changes in net unrealized appreciation (depreciation) on investments | (36,026) | 11,055
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 | (28,313) | (31,927)
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 | (27,126) | 28,664
Senior Secured First Lien Debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 1,565,171 | 1,579,512
Investments purchased | 520,073 | 393,865
Accretion of discount | 15,925 | 13,285
Sales and principal repayments | (504,464) | (417,773)
Ending balance | 1,563,256 | 1,565,171
Changes in net unrealized appreciation (depreciation) on investments | (11,576) | 5,416
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 | (25,105) | (24,261)
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 | (8,344) | 20,543
Senior Secured Second Lien Debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 29,111 | 38,769
Investments purchased | 393 | 57
Accretion of discount | 809 | 204
Sales and principal repayments | (25,486) | (18)
Ending balance | 2,680 | 29,111
Changes in net unrealized appreciation (depreciation) on investments | (2,120) | (9,901)
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 | (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 | 9,662 | (9,901)
Collateralized securities and structured products - equity |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 1,096 | 1,179
Investments purchased | 2,002 | 0
Accretion of discount | 0 | 0
Sales and principal repayments | (174) | (325)
Ending balance | 2,682 | 1,096
Changes in net unrealized appreciation (depreciation) on investments | (229) | 242
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 | (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 | 968 | 242
Unsecured debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 12,874 | 22,643
Investments purchased | 6,682 | 5,449
Accretion of discount | 39 | 17
Sales and principal repayments | (8,927) | (4,200)
Ending balance | 11,814 | 12,874
Changes in net unrealized appreciation (depreciation) on investments | 1,052 | (11,035)
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 | 1,146 | (11,035)
Equity |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 205,909 | 73,951
Investments purchased | 61,470 | 111,200
Accretion of discount | 0 | 0
Sales and principal repayments | (27,338) | (391)
Ending balance | 219,294 | 205,909
Changes in net unrealized appreciation (depreciation) on investments | (23,153) | 26,333
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 | 9,811 | (7,666)
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 | $ (30,558) | $ 28,815

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