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SEGMENT REPORTING - Servicing Segment Revenues (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Segment Reporting Information [Line Items]    
Servicing revenue, net $ 1,031,793 $ 540,558
Servicing    
Segment Reporting Information [Line Items]    
Servicing fee revenue, net and interest income from MSRs and MSR financing receivables 308,152 180,667
Ancillary and other fees 40,906 38,886
Realization of cash flows (133,276) (209,269)
Change in valuation inputs and assumptions and other 630,593 356,620
Servicing revenue, net 846,375 366,904
Servicing | MSR assets    
Segment Reporting Information [Line Items]    
Servicing fee revenue, net and interest income from MSRs and MSR financing receivables 281,110 152,478
Residential mortgage loan UPB and other collateral 398,730 222,235
Servicing | Residential whole loans    
Segment Reporting Information [Line Items]    
Servicing fee revenue, net and interest income from MSRs and MSR financing receivables 3,389 1,077
Residential mortgage loan UPB and other collateral 11,982 7,739
Servicing | Third party    
Segment Reporting Information [Line Items]    
Servicing fee revenue, net and interest income from MSRs and MSR financing receivables 23,653 27,112
Residential mortgage loan UPB and other collateral $ 86,179 $ 74,613