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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

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