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SEGMENT REPORTING - Servicing Segment Revenues (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]      
Servicing revenue, net $ 984,201 $ (526,637) $ 632,152
Servicing      
Segment Reporting Information [Line Items]      
Servicing fee revenue, net and interest income from MSRs and MSR financing receivables 851,989 767,230 446,638
Ancillary and other fees 173,899 123,961 78,466
Realization of cash flows (783,349) (792,680) (243,147)
Change in valuation inputs and assumptions and other 469,694 (301,659) (69,987)
Servicing revenue, net 712,233 (203,148) 211,970
Servicing | MSR assets      
Segment Reporting Information [Line Items]      
Servicing fee revenue, net and interest income from MSRs and MSR financing receivables 731,924 611,669 367,419
UPB of Underlying Mortgages 389,852 220,880 140,244
Servicing | Residential whole loans      
Segment Reporting Information [Line Items]      
Servicing fee revenue, net and interest income from MSRs and MSR financing receivables 16,448 16,081 8,074
UPB of Underlying Mortgages 14,097 9,993 7,919
Servicing | Third party      
Segment Reporting Information [Line Items]      
Servicing fee revenue, net and interest income from MSRs and MSR financing receivables 103,617 139,480 71,145
UPB of Underlying Mortgages $ 78,814 $ 66,892 $ 71,264