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INVESTMENTS IN MORTGAGE SERVICING RIGHTS AND MORTGAGE SERVICING RIGHTS FINANCING RECEIVABLES - Schedule of Investment in MSRs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of Mortgage Servicing Rights Financing Receivable [Line Items]      
Weighted Average Life (Years) 1 year 2 months 2 days    
Mortgage servicing rights financing receivables, at fair value $ 598,728 $ 0  
MSRs      
Schedule of Mortgage Servicing Rights Financing Receivable [Line Items]      
UPB of Underlying Mortgages $ 172,454,150    
Weighted Average Life (Years) 6 years 3 months 22 days    
Amortized Cost Basis $ 1,476,330    
Carrying Value $ 1,735,504    
Discount rate 9.10% 12.00%  
Mortgage Servicing Rights Financing Receivable      
Schedule of Mortgage Servicing Rights Financing Receivable [Line Items]      
Discount rate 9.40%    
Agency | MSRs      
Schedule of Mortgage Servicing Rights Financing Receivable [Line Items]      
UPB of Underlying Mortgages $ 172,392,496 $ 79,935,302  
Weighted Average Life (Years) 6 years 3 months 22 days 7 years 10 days  
Amortized Cost Basis $ 1,476,330 $ 555,804  
Carrying Value 1,735,504 659,483  
Non-Agency | MSRs      
Schedule of Mortgage Servicing Rights Financing Receivable [Line Items]      
UPB of Underlying Mortgages $ 61,654    
Weighted Average Life (Years) 5 years 7 months 22 days    
Amortized Cost Basis $ 0    
Carrying Value 0    
MSRs      
Schedule of Mortgage Servicing Rights Financing Receivable [Line Items]      
Carrying Value 1,735,504 $ 659,483 $ 0
MSRs | Mortgage Servicing Rights Financing Receivable      
Schedule of Mortgage Servicing Rights Financing Receivable [Line Items]      
UPB of Underlying Mortgages $ 64,344,893    
Weighted Average Life (Years) 5 years 10 months 4 days    
Amortized Cost Basis $ 489,144    
Mortgage servicing rights financing receivables, at fair value 598,728    
MSRs | Agency | Mortgage Servicing Rights Financing Receivable      
Schedule of Mortgage Servicing Rights Financing Receivable [Line Items]      
UPB of Underlying Mortgages $ 49,498,415    
Weighted Average Life (Years) 5 years 10 months 26 days    
Amortized Cost Basis $ 428,657    
Mortgage servicing rights financing receivables, at fair value 476,206    
MSRs | Non-Agency | Mortgage Servicing Rights Financing Receivable      
Schedule of Mortgage Servicing Rights Financing Receivable [Line Items]      
UPB of Underlying Mortgages $ 14,846,478    
Weighted Average Life (Years) 5 years 7 months 22 days    
Amortized Cost Basis $ 60,487    
Mortgage servicing rights financing receivables, at fair value $ 122,522