EXCESS MORTGAGE SERVICING RIGHTS - Schedule of Components of Excess MSRs (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Servicing Assets at Fair Value [Line Items]
Carrying Value	$ 8,706,723	$ 8,405,938
Excess MSRs, at fair value
Servicing Assets at Fair Value [Line Items]
Carrying Value	255,111	271,150
Direct investments in Excess MSRs
Servicing Assets at Fair Value [Line Items]
Carrying Value	199,363	208,385
Excess MSR joint ventures
Servicing Assets at Fair Value [Line Items]
Carrying Value	$ 55,748	$ 62,765