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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