EXPENSES, REALIZED AND UNREALIZED GAINS (LOSSES) ON INVESTMENTS AND OTHER - Schedule of General and Administrative Expenses (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]
Legal and professional	$ 35,348	$ 16,310	$ 65,447	$ 65,718
Loan origination	11,929	16,991	33,280	91,907
Occupancy	13,004	29,916	40,981	88,579
Subservicing	31,483	37,899	109,370	126,694
Loan servicing	5,381	3,371	10,878	13,541
Property and maintenance	25,480	24,698	73,450	70,409
Other	67,850	85,439	205,732	229,285
Total general and administrative expenses	$ 190,475	$ 214,624	$ 539,138	$ 686,133