EXCESS MORTGAGE SERVICING RIGHTS - Schedule of Excess Mortgage Servicing Rights (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Servicing Assets at Fair Value [Line Items]
Fair value	$ 8,405,938	$ 8,889,403	$ 6,858,803
Excess mortgage servicing rights assets, at fair value
Servicing Assets at Fair Value [Line Items]
Fair value	271,150	321,803
Direct investments in Excess MSRs
Servicing Assets at Fair Value [Line Items]
Fair value	208,385	249,366	$ 259,198
Excess MSR joint ventures
Servicing Assets at Fair Value [Line Items]
Fair value	$ 62,765	$ 72,437