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Income Taxes - Schedule of Accumulated Gains (Losses) as Calculated on Tax Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Income Tax Disclosure [Abstract] |  |  |
Distributable ordinary income | $ 281,140 | $ 104,577 | $ 104,080
Distributable capital gains | 26,953 | 37,000 | 3,229
Other temporary book/tax differences | 0 | (5,506) | (17,389)
Net change in unrealized appreciation/(depreciation) on investments | (58,065) | (10,194) | 109,941
Total accumulated under-distributed (over-distributed) earnings | $ 250,028 | 125,693 | $ 199,861
Total accumulated under-distributed (over-distributed) earnings |  | $ 125,877 |

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