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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
--- | ---
Mar. 31, 2024 | Mar. 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 | 153,023 | 76,685
Accretion of discount | 11,665 | 4,342
Sales and principal repayments | (238,664) | (112,260)
Ending balance | 1,719,718 | 1,629,058
Change in net unrealized (depreciation) appreciation on investments | (12,629) | (50,516)
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 | (9,736) | (4,525)
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 | (10,731) | (51,238)
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 | 128,110 | 40,752
Accretion of discount | 11,573 | 4,269
Sales and principal repayments | (223,684) | (112,175)
Ending balance | 1,465,051 | 1,472,453
Change in net unrealized (depreciation) appreciation on investments | (3,822) | (34,672)
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 | (2,011) | (4,511)
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 | (14,108) | (35,394)
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 | 60 | 0
Accretion of discount | 53 | 69
Sales and principal repayments | (1,481) | (4)
Ending balance | 28,460 | 38,997
Change in net unrealized (depreciation) appreciation on investments | 714 | 163
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 | 12,526 | 163
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 | 0 | 0
Accretion of discount | 0 | 0
Sales and principal repayments | (64) | (81)
Ending balance | 1,004 | 1,133
Change in net unrealized (depreciation) appreciation on investments | (15) | 35
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 | 1,182 | 35
Unsecured debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 12,874 | 22,643
Investments purchased | 1,421 | 0
Accretion of discount | 39 | 4
Sales and principal repayments | (8,872) | 0
Ending balance | 5,506 | 15,517
Change in net unrealized (depreciation) appreciation on investments | (50) | (7,130)
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 | 44 | (7,130)
Equity |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 205,909 | 73,951
Investments purchased | 23,432 | 35,933
Accretion of discount | 0 | 0
Sales and principal repayments | (4,563) | 0
Ending balance | 219,697 | 100,958
Change in net unrealized (depreciation) appreciation on investments | (9,456) | (8,912)
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 | 5,294 | (14)
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 | $ (10,375) | $ (8,912)

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