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Securities, at Fair Value - Impairment and Other Net Gain/(Loss) on Securities and Other Portfolio Investments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Gain (Loss) on Securities [Line Items] |  |  |  |
Total Impairment and other net gain/(loss) on securities and other portfolio investments | $ (2,842) | $ (4,569) | $ (7,618) | $ (1,638)
Securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net unrealized gain/(loss) on other portfolio investments | (3,186) | (3,697) | (7,298) | (766)
Net realized gain/(loss) on other portfolio investments | 2,668 | 0 | 2,668 | 0
Impairment of securities | 0 | 0 | 0 | 0
Total Impairment and other net gain/(loss) on securities and other portfolio investments | (518) | (3,697) | (4,630) | (766)
Other Portfolio Investments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net unrealized gain/(loss) on other portfolio investments | (2,324) | (872) | (2,988) | (872)
Net realized gain/(loss) on other portfolio investments | $ 0 | $ 0 | $ 0 | $ 0

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