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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, 2023 | Dec. 31, 2022
Total |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | $ 1,716,054 | $ 1,632,922
Investments purchased | 510,571 | 608,596
Accretion of discount | 13,506 | 11,032
Sales and principal repayments | (422,707) | (498,527)
Ending balance | 1,814,161 | 1,716,054
Change in net unrealized (depreciation) appreciation on investments still held | 11,055 | (45,670)
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 | (31,927) | (32,747)
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 | 28,664 | (5,222)
Senior Secured First Lien Debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 1,579,512 | 1,526,989
Investments purchased | 393,865 | 549,950
Accretion of discount | 13,285 | 10,517
Sales and principal repayments | (417,773) | (480,717)
Ending balance | 1,565,171 | 1,579,512
Change in net unrealized (depreciation) appreciation on investments still held | 5,416 | (39,831)
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 | (24,261) | (5,646)
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 | 20,543 | (21,581)
Senior Secured Second Lien Debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 38,769 | 38,583
Investments purchased | 57 | 19,930
Accretion of discount | 204 | 500
Sales and principal repayments | (18) | (15,521)
Ending balance | 29,111 | 38,769
Change in net unrealized (depreciation) appreciation on investments still held | (9,901) | 801
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 | (19,327)
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 | (9,901) | 14,604
Collateralized securities and structured products - equity |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 1,179 | 2,998
Investments purchased | 0 | 0
Accretion of discount | 0 | 0
Sales and principal repayments | (325) | (1,222)
Ending balance | 1,096 | 1,179
Change in net unrealized (depreciation) appreciation on investments still held | 242 | (621)
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 | 24
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 | 242 | (621)
Unsecured debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 22,643 | 26,616
Investments purchased | 5,449 | 3,635
Accretion of discount | 17 | 15
Sales and principal repayments | (4,200) | 0
Ending balance | 12,874 | 22,643
Change in net unrealized (depreciation) appreciation on investments still held | (11,035) | (7,623)
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 | (11,035) | (7,623)
Equity |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 73,951 | 37,736
Investments purchased | 111,200 | 35,081
Accretion of discount | 0 | 0
Sales and principal repayments | (391) | (1,067)
Ending balance | 205,909 | 73,951
Change in net unrealized (depreciation) appreciation on investments still held | 26,333 | 1,604
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 | (7,666) | (7,798)
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 | $ 28,815 | $ 9,999

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