EXCESS MORTGAGE SERVICING RIGHTS - Schedule of Direct Investments in Excess MSRs and Changes in Fair Value of Excess MSR Investments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]
Weighted Average Life (Years)	1 year 2 months 12 days
Agency
Schedule of Equity Method Investments [Line Items]
Original and Recaptured Pools	$ (1,922)	$ (9,818)
Excess MSRs
Schedule of Equity Method Investments [Line Items]
Unpaid Principal Balance	$ 41,899,426
Weighted Average Life (Years)	6 years
Amortized Cost Basis	$ 174,621
Carrying Value	$ 199,363		$ 208,385
Excess MSRs | Minimum
Schedule of Equity Method Investments [Line Items]
Interest in Excess MSR	32.50%
Excess MSRs | Maximum
Schedule of Equity Method Investments [Line Items]
Interest in Excess MSR	100.00%
Excess MSRs | Weighted Average
Schedule of Equity Method Investments [Line Items]
Interest in Excess MSR	56.40%
Excess MSRs | Former Manager-managed funds | Minimum
Schedule of Equity Method Investments [Line Items]
Interest in Excess MSR	0.00%
Excess MSRs | Former Manager-managed funds | Maximum
Schedule of Equity Method Investments [Line Items]
Interest in Excess MSR	50.00%
Excess MSRs | Mr. Cooper | Minimum
Schedule of Equity Method Investments [Line Items]
Interest in Excess MSR	0.00%
Excess MSRs | Mr. Cooper | Maximum
Schedule of Equity Method Investments [Line Items]
Interest in Excess MSR	35.00%
Servicer Advances | Servicer advance investments
Schedule of Equity Method Investments [Line Items]
Unpaid Principal Balance	$ 14,900,000