Quarterly report pursuant to Section 13 or 15(d)

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

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INVESTMENTS IN MORTGAGE SERVICING RIGHTS AND MSR FINANCING RECEIVABLES - Schedule of Investment in MSRs (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Servicing Asset at Amortized Cost [Line Items]      
Weighted Average Life (Years) 24 days    
Carrying Value $ 5,243,229 $ 4,528,604  
Carrying value of mortgage servicing rights financing receivable 1,811,261 1,644,504  
Residential mortgage loans subject to repurchase $ 168,532 $ 121,602 $ 110,181
MSRs      
Servicing Asset at Amortized Cost [Line Items]      
Discount rate 7.50%    
Mortgage Servicing Rights Financing Receivable      
Servicing Asset at Amortized Cost [Line Items]      
UPB of Underlying Mortgages $ 460,450,520    
Weighted Average Life (Years) 5 years 2 months 12 days    
Amortized Cost Basis $ 4,864,369    
Carrying Value $ 5,243,229    
Discount rate 8.80%    
Agency | MSRs      
Servicing Asset at Amortized Cost [Line Items]      
UPB of Underlying Mortgages $ 288,673,487    
Weighted Average Life (Years) 4 years 10 months 24 days    
Amortized Cost Basis $ 2,968,392    
Carrying Value 3,038,721    
Agency | Mortgage Servicing Rights Financing Receivable      
Servicing Asset at Amortized Cost [Line Items]      
UPB of Underlying Mortgages $ 61,162,569    
Weighted Average Life (Years) 4 years 3 months 18 days    
Amortized Cost Basis $ 659,950    
Carrying Value 597,990    
Non-Agency | MSRs      
Servicing Asset at Amortized Cost [Line Items]      
UPB of Underlying Mortgages $ 2,350,471    
Weighted Average Life (Years) 5 years 7 months 6 days    
Amortized Cost Basis $ 12,294    
Carrying Value 20,321    
Non-Agency | Mortgage Servicing Rights Financing Receivable      
Servicing Asset at Amortized Cost [Line Items]      
UPB of Underlying Mortgages $ 79,360,666    
Weighted Average Life (Years) 7 years 8 months 12 days    
Amortized Cost Basis $ 840,279    
Carrying Value 1,213,271    
Ginnie Mae(C) | MSRs      
Servicing Asset at Amortized Cost [Line Items]      
UPB of Underlying Mortgages $ 28,903,327    
Weighted Average Life (Years) 4 years    
Amortized Cost Basis $ 383,454    
Carrying Value $ 372,926