Securities, at Fair Value - Schedule of Impairment and Other Net (Loss)/Gain on Securities and Other Portfolio Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Net unrealized (loss)/gain on securities	$ (3,230)	$ 1,607	$ (10,486)
Net realized gain from the sale of securities	84	0	90,408
Impairment of securities	0	0	(344,269)
Total Impairment and other net (loss)/gain on securities	(3,146)	1,607	(264,347)
Net unrealized loss on other portfolio investments	(21,921)	0	0
Net realized loss on other portfolio investments	0	0	(5,407)
Reversal of impairment/(Impairment) other portfolio investments	0	33,956	(80,813)
Gain on investment in Lima One common equity	0	38,933	0
Total Impairment and other net (loss)/gain on securities and other portfolio investments	$ (25,067)	$ 74,496	$ (350,567)