Securities, at Fair Value - Impairment and Other Net Gain/(Loss) on Securities and Other Portfolio Investments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Net unrealized gain/(loss) on securities	$ (4,112)	$ 2,931
Net realized gain/(loss) from the sale of securities	0	0
Impairment of securities	0	0
Total Impairment and other net gain/(loss) on securities	(4,112)	2,931
Net unrealized gain/(loss) on other portfolio investments	(664)	0
Net realized gain/(loss) on other portfolio investments	0	0
Total Impairment and other net gain/(loss) on securities and other portfolio investments	$ (4,776)	$ 2,931