MORTGAGE SERVICING RIGHTS AND MSR FINANCING RECEIVABLES - Schedule of Type of Advances Included in the Servicer Advances Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Transfers and Servicing of Financial Assets [Abstract]
Principal and interest advances	$ 624,563	$ 616,801
Escrow advances (taxes and insurance advances)	1,358,320	1,442,697
Foreclosure advances	891,268	767,171
Gross advance balance	2,874,151	2,826,669
Reserves, impairment, unamortized discount, net of recovery accruals	(99,641)	(66,419)
Total servicer advances receivable	2,774,510	2,760,250
Servicer advances receivable related to agency MSRs	550,800	585,000
Servicer advances receivable related to Ginnie Mae MSRS, recoverable from Ginnie Mae	$ 367,800	$ 405,600