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
6 Months Ended
Jun. 17, 2019
May 21, 2019
Apr. 19, 2019
Apr. 02, 2019
Mar. 29, 2019
Feb. 28, 2019
Jan. 18, 2018
Nov. 29, 2017
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Jan. 01, 2018
Jul. 23, 2017
Dec. 28, 2016
Schedule of MSRs [Line Items]                              
UPB of Underlying Mortgages                 $ 74,500,000            
Payments to acquire MSRs   $ 218,000 $ 230,500 $ 84,400 $ 126,900 $ 116,700     841,600            
Residential mortgage loans subject to repurchase                 141,581   $ 121,602 $ 0      
Residential mortgage loans repurchase liability                 141,581   $ 121,602        
Ocwen                              
Schedule of MSRs [Line Items]                              
UPB of Underlying Mortgages                         $ 86,800,000 $ 110,000,000  
Payments to acquire MSRs             $ 279,600                
MSRs                              
Schedule of MSRs [Line Items]                              
UPB of Underlying Mortgages     $ 18,500,000   $ 10,000,000 9,500,000                  
Mortgage Loans Subserviced                              
Schedule of MSRs [Line Items]                              
UPB of Underlying Mortgages                 51,100,000            
Subservicing revenue                 $ 64,700            
Nationstar                              
Schedule of MSRs [Line Items]                              
Subservicer percent of UPB                 26.00%            
Nationstar | MSRs                              
Schedule of MSRs [Line Items]                              
UPB of Underlying Mortgages           $ 9,500,000                  
Ocwen                              
Schedule of MSRs [Line Items]                              
Subservicer percent of UPB                 18.90%            
Ocwen | New Residential Mortgage LLC | MSRs                              
Schedule of MSRs [Line Items]                              
Unpaid principal balance of underlying loans, transferred                 $ 66,700,000            
LoanCare                              
Schedule of MSRs [Line Items]                              
Subservicer percent of UPB                 14.90%            
PHH Mortgage Corporation                              
Schedule of MSRs [Line Items]                              
Subservicer percent of UPB                 11.40%            
PHH Mortgage Corporation | MSRs                              
Schedule of MSRs [Line Items]                              
UPB of Underlying Mortgages                             $ 54,100,000
Ditech Financial LLC                              
Schedule of MSRs [Line Items]                              
Subservicer percent of UPB                 3.60%            
Flagstar                              
Schedule of MSRs [Line Items]                              
Subservicer percent of UPB                 0.50%            
ShellPoint | New Residential Mortgage LLC | MSRs                              
Schedule of MSRs [Line Items]                              
UPB of Underlying Mortgages               $ 7,800,000              
Payments to acquire MSRs               $ 81,000              
Ditech Holding Corporation and Ditech Financial LLC | New Residential Mortgage LLC | MSRs                              
Schedule of MSRs [Line Items]                              
UPB of Underlying Mortgages                   $ 63,000,000          
Payments to acquire MSRs $ 70,000                            
United Shore | MSRs                              
Schedule of MSRs [Line Items]                              
UPB of Underlying Mortgages   $ 23,700,000   $ 8,200,000