v3.26.3
Securities, at Fair Value - Impairment and Other Net Gain/(Loss) on Securities and Other Portfolio Investments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Gain (Loss) on Securities [Line Items]        
Total Impairment and other net gain/(loss) on securities and other portfolio investments $ (223,303) $ 18,004 $ (265,423) $ 45,828
Securities        
Gain (Loss) on Securities [Line Items]        
Net unrealized gain/(loss) on other portfolio investments (199,592) 17,798 (242,825) 42,006
Net realized gain/(loss) on other portfolio investments (23,753) 668 (23,753) 902
Impairment of securities 0 0 0 0
Total Impairment and other net gain/(loss) on securities and other portfolio investments (223,345) 18,466 (266,578) 42,908
Other Portfolio Investments        
Gain (Loss) on Securities [Line Items]        
Net unrealized gain/(loss) on other portfolio investments 0 (488) 3,928 2,901
Net realized gain/(loss) on other portfolio investments 42 26 (2,773) 19
Reversal of impairment/(impairment) on other portfolio investments $ 0 $ 0 $ 0 $ 0