Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS IN MORTGAGE SERVICING RIGHTS AND MORTGAGE SERVICING RIGHTS FINANCING RECEIVABLES - Schedule of Investment in MSRs (Details)

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INVESTMENTS IN MORTGAGE SERVICING RIGHTS AND MORTGAGE SERVICING RIGHTS FINANCING RECEIVABLES - Schedule of Investment in MSRs (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Apr. 19, 2019
Mar. 29, 2019
Feb. 28, 2019
Dec. 31, 2018
Servicing Asset at Amortized Cost [Line Items]          
UPB of Underlying Mortgages $ 74,500,000        
Weighted Average Life (Years) 24 days        
Carrying value of mortgage servicing rights financing receivable $ 1,941,139       $ 1,644,504
MSRs          
Servicing Asset at Amortized Cost [Line Items]          
UPB of Underlying Mortgages $ 276,709,482        
Weighted Average Life (Years) 5 years 1 month 6 days        
Amortized Cost Basis $ 2,880,083        
Carrying Value $ 2,976,008        
Discount rate 8.00%        
Mortgage Servicing Rights Financing Receivable          
Servicing Asset at Amortized Cost [Line Items]          
Discount rate 9.50%        
Agency | MSRs          
Servicing Asset at Amortized Cost [Line Items]          
UPB of Underlying Mortgages $ 245,510,334        
Weighted Average Life (Years) 5 years 2 months 12 days        
Amortized Cost Basis $ 2,505,292        
Carrying Value 2,621,004        
Non-Agency | MSRs          
Servicing Asset at Amortized Cost [Line Items]          
UPB of Underlying Mortgages $ 2,186,456        
Weighted Average Life (Years) 3 years 8 months 12 days        
Amortized Cost Basis $ 14,679        
Carrying Value 17,791        
Ginnie Mae | MSRs          
Servicing Asset at Amortized Cost [Line Items]          
UPB of Underlying Mortgages $ 29,012,692        
Weighted Average Life (Years) 4 years 7 months 6 days        
Amortized Cost Basis $ 360,112        
Carrying Value 337,213        
MSRs          
Servicing Asset at Amortized Cost [Line Items]          
UPB of Underlying Mortgages   $ 18,500,000 $ 10,000,000 $ 9,500,000  
Carrying Value 2,976,008       $ 2,884,100
MSRs | Mortgage Servicing Rights Financing Receivable          
Servicing Asset at Amortized Cost [Line Items]          
UPB of Underlying Mortgages $ 160,799,425        
Weighted Average Life (Years) 6 years 7 months 6 days        
Amortized Cost Basis $ 1,609,086        
Carrying value of mortgage servicing rights financing receivable 1,941,139        
MSRs | Agency | Mortgage Servicing Rights Financing Receivable          
Servicing Asset at Amortized Cost [Line Items]          
UPB of Underlying Mortgages $ 78,168,877        
Weighted Average Life (Years) 5 years 2 months 12 days        
Amortized Cost Basis $ 736,708        
Carrying value of mortgage servicing rights financing receivable 745,523        
MSRs | Non-Agency | Mortgage Servicing Rights Financing Receivable          
Servicing Asset at Amortized Cost [Line Items]          
UPB of Underlying Mortgages $ 82,630,548        
Weighted Average Life (Years) 7 years 10 months 24 days        
Amortized Cost Basis $ 872,378        
Carrying value of mortgage servicing rights financing receivable $ 1,195,616