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Distributable Taxable Income - Components of Accumulated Earnings on Tax Basis (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Investment Company, Distributable Earnings [Abstract] |  |  |
Capital loss carryforward | $ (418,937) | $ (385,880) | $ (339,584)
Other temporary differences |  | (375) | (370)
Net unrealized depreciation | $ 77,496 | $ 69,611 | $ (82,993)

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