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Securities, at Fair Value - Impairment and Other Net Gain/(Loss) on Securities and Other Portfolio Investments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract] |  |  |
Net unrealized gain/(loss) on securities | $ 7,341 | $ (3,230) | $ 1,607
Net realized gain from the sale of securities | 908 | 84 | 0
Total Impairment and other net gain/(loss) on securities | 8,249 | (3,146) | 1,607
Net unrealized gain/(loss) on other portfolio investments | 6,180 | (21,921) | 0
Net realized loss on other portfolio investments | (5,869) | 0 | 0
Reversal of impairment/(impairment) other portfolio investments | (2,335) | 0 | 33,956
Gain on investment in Lima One common equity | 0 | 0 | 38,933
Total Impairment and other net gain/(loss) on securities and other portfolio investments | $ 6,225 | $ (25,067) | $ 74,496

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