EXPENSES, REALIZED AND UNREALIZED GAINS (LOSSES) ON INVESTMENTS AND OTHER - Schedule of Components of Other Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Other Income and Expenses [Abstract]
Real estate and other securities	$ 83,851	$ (606,852)
Residential mortgage loans and REO	18,097	(88,523)
Derivative instruments	(151,006)	622,172
Other	(26,591)	(12,732)
Realized and unrealized gains (losses) on investments, net	(75,649)	(85,935)
Unrealized gain (loss) on secured notes and bonds payable	(2,500)	7,194
Rental revenue	18,123	8,129
Property and maintenance revenue	33,637	34,305
(Provision) reversal for credit losses on securities	1,228	(711)
Valuation and credit loss (provision) reversal on loans and real estate owned	1,575	(3,029)
Other income (loss)	(21,585)	6,444
Other income (loss), net	30,478	52,332
Total other income (loss)	$ (45,171)	$ (33,603)