EXPENSES, REALIZED AND UNREALIZED GAINS (LOSSES) ON INVESTMENTS AND OTHER - Schedule of Components of Other Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Other Income and Expenses [Abstract]
Real estate and other securities	$ (315,612)	$ (463,607)	$ (354,339)	$ (1,590,625)
Residential mortgage loans and REO	(12,437)	(35,310)	(4,463)	(166,927)
Derivative instruments	194,593	464,618	259,539	1,503,183
Other	5,948	181	(14,469)	(2,287)
Realized and unrealized gains (losses) on investments, net	(127,508)	(34,118)	(113,732)	(256,656)
Unrealized gain (loss) on secured notes and bonds payable	3,840	15,128	5,889	50,279
Rental revenue	18,297	16,937	54,163	37,339
Property and maintenance revenue	33,953	34,520	100,707	100,860
(Provision) reversal for credit losses on securities	(2,798)	(2,812)	(3,605)	(5,697)
Valuation and credit loss (provision) reversal on loans and real estate owned	(647)	(3,932)	(2,849)	(8,575)
Other income (loss)	18,402	(36,599)	(36,920)	(39,244)
Other income (loss), net	71,047	23,242	117,385	134,962
Total other income (loss)	$ (56,461)	$ (10,876)	$ 3,653	$ (121,694)