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Taxable Income - Components of Accumulated Earnings on Tax Basis (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Retained Earnings (Accumulated Deficit) [Abstract] |  |  |
Undistributed ordinary income | $ 4,586 | $ 7,064 | $ 4,917
Capital loss carryforward | (487,186) | (445,684) | (418,937)
Net unrealized depreciation | (53,330) | 72,584 | 77,496
Total | $ (535,930) | $ (366,036) | $ (336,524)

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