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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, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Gain (Loss) on Securities [Line Items] |  |  |  |
Total Impairment and other net gain/(loss) on securities and other portfolio investments | $ (3,850) | $ 6,645 | $ (42,120) | $ 27,824
Securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net unrealized gain/(loss) on other portfolio investments | (4,362) | 4,008 | (43,233) | 24,208
Net realized gain/(loss) on other portfolio investments | 0 | 0 | 0 | 234
Impairment of securities | 0 | 0 | 0 | 0
Total Impairment and other net gain/(loss) on securities and other portfolio investments | (4,362) | 4,008 | (43,233) | 24,442
Other Portfolio Investments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net unrealized gain/(loss) on other portfolio investments | 501 | 2,636 | 3,928 | 3,389
Net realized gain/(loss) on other portfolio investments | 11 | 1 | (2,815) | (7)
Reversal of impairment/(impairment) on other portfolio investments | $ 0 | $ 0 | $ 0 | $ 0

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