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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

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