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
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Servicing Asset at Amortized Cost [Line Items]    
UPB of Underlying Mortgages $ 21,900,000  
Weighted Average Life (Years) 27 days  
Carrying value of mortgage servicing rights financing receivable $ 1,717,872 $ 1,644,504
MSRs    
Servicing Asset at Amortized Cost [Line Items]    
UPB of Underlying Mortgages $ 264,204,829  
Weighted Average Life (Years) 6 years 6 months  
Amortized Cost Basis $ 2,684,666  
Carrying Value $ 3,017,453  
Discount rate 8.10%  
Mortgage Servicing Rights Financing Receivable    
Servicing Asset at Amortized Cost [Line Items]    
Discount rate 9.70%  
Agency | MSRs    
Servicing Asset at Amortized Cost [Line Items]    
UPB of Underlying Mortgages $ 232,585,093  
Weighted Average Life (Years) 6 years 4 months 24 days  
Amortized Cost Basis $ 2,306,585  
Carrying Value 2,661,626  
Non-Agency | MSRs    
Servicing Asset at Amortized Cost [Line Items]    
UPB of Underlying Mortgages $ 2,312,087  
Weighted Average Life (Years) 6 years 3 months 18 days  
Amortized Cost Basis $ 17,523  
Carrying Value 22,254  
Ginnie Mae | MSRs    
Servicing Asset at Amortized Cost [Line Items]    
UPB of Underlying Mortgages $ 29,307,649  
Weighted Average Life (Years) 6 years 10 months 24 days  
Amortized Cost Basis $ 360,558  
Carrying Value 333,573  
MSRs    
Servicing Asset at Amortized Cost [Line Items]    
Carrying Value 3,017,453 $ 2,884,100
MSRs | Mortgage Servicing Rights Financing Receivable    
Servicing Asset at Amortized Cost [Line Items]    
UPB of Underlying Mortgages $ 135,313,045  
Weighted Average Life (Years) 6 years 4 months 24 days  
Amortized Cost Basis $ 1,370,609  
Carrying value of mortgage servicing rights financing receivable 1,717,872  
MSRs | Agency | Mortgage Servicing Rights Financing Receivable    
Servicing Asset at Amortized Cost [Line Items]    
UPB of Underlying Mortgages $ 50,209,316  
Weighted Average Life (Years) 5 years 9 months 18 days  
Amortized Cost Basis $ 469,479  
Carrying value of mortgage servicing rights financing receivable 509,497  
MSRs | Non-Agency | Mortgage Servicing Rights Financing Receivable    
Servicing Asset at Amortized Cost [Line Items]    
UPB of Underlying Mortgages $ 85,103,729  
Weighted Average Life (Years) 6 years 9 months 18 days  
Amortized Cost Basis $ 901,130  
Carrying value of mortgage servicing rights financing receivable $ 1,208,375