Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS IN MORTGAGE SERVICING RIGHTS AND MORTGAGE SERVICING RIGHTS FINANCING RECEIVABLES - Narrative (Details)

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INVESTMENTS IN MORTGAGE SERVICING RIGHTS AND MORTGAGE SERVICING RIGHTS FINANCING RECEIVABLES - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jan. 18, 2018
Nov. 29, 2017
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Jan. 01, 2018
Jul. 23, 2017
Dec. 28, 2016
Schedule of MSRs [Line Items]                
UPB of Underlying Mortgages     $ 21,900,000          
Payments to acquire MSRs     276,200          
Residential mortgage loans subject to repurchase     140,135 $ 121,602 $ 0      
Residential mortgage loans repurchase liability     140,135 $ 121,602        
Ocwen                
Schedule of MSRs [Line Items]                
UPB of Underlying Mortgages           $ 86,800,000 $ 110,000,000  
Payments to acquire MSRs $ 279,600              
Mortgage Loans Subserviced                
Schedule of MSRs [Line Items]                
UPB of Underlying Mortgages     48,500,000          
Subservicing revenue     $ 31,900          
Ocwen                
Schedule of MSRs [Line Items]                
Subservicer percent of UPB     21.30%          
Ocwen | New Residential Mortgage LLC | MSRs                
Schedule of MSRs [Line Items]                
Unpaid principal balance of underlying loans, transferred     $ 64,400,000          
Nationstar                
Schedule of MSRs [Line Items]                
Subservicer percent of UPB     25.40%          
Nationstar | MSRs                
Schedule of MSRs [Line Items]                
UPB of Underlying Mortgages               $ 9,500,000
Ditech Financial LLC                
Schedule of MSRs [Line Items]                
Subservicer percent of UPB     19.90%          
PHH Mortgage Corporation                
Schedule of MSRs [Line Items]                
Subservicer percent of UPB     10.20%          
LoanCare                
Schedule of MSRs [Line Items]                
Subservicer percent of UPB       4.30%        
Flagstar                
Schedule of MSRs [Line Items]                
Subservicer percent of UPB     0.60%          
ShellPoint | New Residential Mortgage LLC | MSRs                
Schedule of MSRs [Line Items]                
UPB of Underlying Mortgages   $ 7,800,000            
Payments to acquire MSRs   $ 81,000            
NewRez, formally New Penn | MSRs                
Schedule of MSRs [Line Items]                
UPB of Underlying Mortgages               $ 54,100,000