EXPENSES, REALIZED AND UNREALIZED GAINS (LOSSES), NET AND OTHER - Schedule of General and Administrative Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Other Income and Expenses [Abstract]
Legal and professional	$ 103,795	$ 78,837	$ 102,114
Loan origination	45,123	108,149	196,989
Occupancy	55,883	116,526	70,616
Subservicing	130,346	162,972	224,138
Loan servicing	16,185	11,759	16,440
Property and maintenance	97,582	93,689	69,083
Other	281,838	303,496	184,648
Total general and administrative expenses	$ 730,752	$ 875,428	$ 864,028