Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS IN EXCESS MORTGAGE SERVICING RIGHTS - Summary of Direct Investments in Excess MSRs (Details)

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INVESTMENTS IN EXCESS MORTGAGE SERVICING RIGHTS - Summary of Direct Investments in Excess MSRs (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Investment [Line Items]          
Weighted Average Life (Years)     1 year 3 months 18 days    
Carrying Value $ 1,749,343   $ 1,749,343   $ 659,483
Principal investment gain (loss) (19,180) $ (15,263) (18,359) $ (7,337)  
Servicer Advance Joint Venture [Member] | Servicer Advances [Member]          
Investment [Line Items]          
UPB of Underlying Mortgages 169,570,376   169,570,376   186,362,657
Original and Recaptured Pools [Member]          
Investment [Line Items]          
Principal investment gain (loss) (21,736) (18,694) (28,984) (12,997)  
Recapture Agreements [Member]          
Investment [Line Items]          
Principal investment gain (loss) 2,556 $ 3,431 10,625 $ 5,660  
Excess MSRs [Member]          
Investment [Line Items]          
UPB of Underlying Mortgages 255,460,190   $ 255,460,190    
Weighted Average Life (Years)     6 years 3 months 18 days    
Amortized Cost Basis 1,182,158   $ 1,182,158    
Carrying Value 1,304,666   1,304,666   1,399,455
Excess MSRs [Member] | Nationstar [Member]          
Investment [Line Items]          
Carrying Value 571,422   571,422   611,293
Excess MSRs [Member] | Agency [Member]          
Investment [Line Items]          
UPB of Underlying Mortgages 72,609,125   $ 72,609,125    
Weighted Average Life (Years)     6 years 4 months 24 days    
Amortized Cost Basis 298,664   $ 298,664    
Carrying Value 353,975   353,975   381,757
Excess MSRs [Member] | Agency [Member] | Original and Recaptured Pools [Member]          
Investment [Line Items]          
UPB of Underlying Mortgages 72,609,125   $ 72,609,125    
Weighted Average Life (Years)     5 years 10 months 24 days    
Amortized Cost Basis 277,034   $ 277,034    
Carrying Value $ 304,980   $ 304,980   330,323
Excess MSRs [Member] | Agency [Member] | Original and Recaptured Pools [Member] | Minimum [Member]          
Investment [Line Items]          
Interest in Excess MSR 32.50%   32.50%    
Excess MSRs [Member] | Agency [Member] | Original and Recaptured Pools [Member] | Maximum [Member]          
Investment [Line Items]          
Interest in Excess MSR 66.70%   66.70%    
Excess MSRs [Member] | Agency [Member] | Original and Recaptured Pools [Member] | Weighted Average [Member]          
Investment [Line Items]          
Interest in Excess MSR 53.20%   53.20%    
Excess MSRs [Member] | Agency [Member] | Recapture Agreements [Member]          
Investment [Line Items]          
UPB of Underlying Mortgages $ 0   $ 0    
Weighted Average Life (Years)     12 years 7 months 6 days    
Amortized Cost Basis 21,630   $ 21,630    
Carrying Value $ 48,995   $ 48,995   51,434
Excess MSRs [Member] | Agency [Member] | Recapture Agreements [Member] | Minimum [Member]          
Investment [Line Items]          
Interest in Excess MSR 32.50%   32.50%    
Excess MSRs [Member] | Agency [Member] | Recapture Agreements [Member] | Maximum [Member]          
Investment [Line Items]          
Interest in Excess MSR 66.70%   66.70%    
Excess MSRs [Member] | Agency [Member] | Recapture Agreements [Member] | Weighted Average [Member]          
Investment [Line Items]          
Interest in Excess MSR 53.20%   53.20%    
Excess MSRs [Member] | Agency [Member] | Fortress [Member] | Original and Recaptured Pools [Member] | Minimum [Member]          
Investment [Line Items]          
Interest in Excess MSR 0.00%   0.00%    
Excess MSRs [Member] | Agency [Member] | Fortress [Member] | Original and Recaptured Pools [Member] | Maximum [Member]          
Investment [Line Items]          
Interest in Excess MSR 40.00%   40.00%    
Excess MSRs [Member] | Agency [Member] | Fortress [Member] | Recapture Agreements [Member] | Minimum [Member]          
Investment [Line Items]          
Interest in Excess MSR 0.00%   0.00%    
Excess MSRs [Member] | Agency [Member] | Fortress [Member] | Recapture Agreements [Member] | Maximum [Member]          
Investment [Line Items]          
Interest in Excess MSR 40.00%   40.00%    
Excess MSRs [Member] | Agency [Member] | Nationstar [Member] | Original and Recaptured Pools [Member] | Minimum [Member]          
Investment [Line Items]          
Interest in Excess MSR 20.00%   20.00%    
Excess MSRs [Member] | Agency [Member] | Nationstar [Member] | Original and Recaptured Pools [Member] | Maximum [Member]          
Investment [Line Items]          
Interest in Excess MSR 35.00%   35.00%    
Excess MSRs [Member] | Agency [Member] | Nationstar [Member] | Recapture Agreements [Member] | Minimum [Member]          
Investment [Line Items]          
Interest in Excess MSR 20.00%   20.00%    
Excess MSRs [Member] | Agency [Member] | Nationstar [Member] | Recapture Agreements [Member] | Maximum [Member]          
Investment [Line Items]          
Interest in Excess MSR 35.00%   35.00%    
Excess MSRs [Member] | Non-Agency [Member]          
Investment [Line Items]          
UPB of Underlying Mortgages $ 182,851,065   $ 182,851,065    
Weighted Average Life (Years)     6 years 3 months 18 days    
Amortized Cost Basis 883,494   $ 883,494    
Carrying Value 950,691   950,691   1,017,698
Excess MSRs [Member] | Non-Agency [Member] | Original and Recaptured Pools [Member]          
Investment [Line Items]          
UPB of Underlying Mortgages 70,867,185   $ 70,867,185    
Weighted Average Life (Years)     5 years 3 months 18 days    
Amortized Cost Basis 167,751   $ 167,751    
Carrying Value $ 199,753   $ 199,753   219,980
Excess MSRs [Member] | Non-Agency [Member] | Original and Recaptured Pools [Member] | Minimum [Member]          
Investment [Line Items]          
Interest in Excess MSR 33.30%   33.30%    
Excess MSRs [Member] | Non-Agency [Member] | Original and Recaptured Pools [Member] | Maximum [Member]          
Investment [Line Items]          
Interest in Excess MSR 100.00%   100.00%    
Excess MSRs [Member] | Non-Agency [Member] | Original and Recaptured Pools [Member] | Weighted Average [Member]          
Investment [Line Items]          
Interest in Excess MSR 59.40%   59.40%    
Excess MSRs [Member] | Non-Agency [Member] | Recapture Agreements [Member]          
Investment [Line Items]          
UPB of Underlying Mortgages $ 0   $ 0    
Weighted Average Life (Years)     12 years 6 months    
Amortized Cost Basis 9,157   $ 9,157    
Carrying Value $ 20,450   $ 20,450   13,491
Excess MSRs [Member] | Non-Agency [Member] | Recapture Agreements [Member] | Minimum [Member]          
Investment [Line Items]          
Interest in Excess MSR 33.30%   33.30%    
Excess MSRs [Member] | Non-Agency [Member] | Recapture Agreements [Member] | Maximum [Member]          
Investment [Line Items]          
Interest in Excess MSR 100.00%   100.00%    
Excess MSRs [Member] | Non-Agency [Member] | Recapture Agreements [Member] | Weighted Average [Member]          
Investment [Line Items]          
Interest in Excess MSR 59.40%   59.40%    
Excess MSRs [Member] | Non-Agency [Member] | Ocwen Serviced Pools [Member]          
Investment [Line Items]          
UPB of Underlying Mortgages $ 111,983,880   $ 111,983,880    
Interest in Excess MSR 100.00%   100.00%    
Weighted Average Life (Years)     6 years 4 months 24 days    
Amortized Cost Basis $ 706,586   $ 706,586    
Carrying Value $ 730,488   $ 730,488   $ 784,227
Excess MSRs [Member] | Non-Agency [Member] | Fortress [Member] | Original and Recaptured Pools [Member] | Minimum [Member]          
Investment [Line Items]          
Interest in Excess MSR 0.00%   0.00%    
Excess MSRs [Member] | Non-Agency [Member] | Fortress [Member] | Original and Recaptured Pools [Member] | Maximum [Member]          
Investment [Line Items]          
Interest in Excess MSR 50.00%   50.00%    
Excess MSRs [Member] | Non-Agency [Member] | Fortress [Member] | Recapture Agreements [Member] | Minimum [Member]          
Investment [Line Items]          
Interest in Excess MSR 0.00%   0.00%    
Excess MSRs [Member] | Non-Agency [Member] | Fortress [Member] | Recapture Agreements [Member] | Maximum [Member]          
Investment [Line Items]          
Interest in Excess MSR 50.00%   50.00%    
Excess MSRs [Member] | Non-Agency [Member] | Fortress [Member] | Ocwen Serviced Pools [Member]          
Investment [Line Items]          
Interest in Excess MSR 0.00%   0.00%    
Excess MSRs [Member] | Non-Agency [Member] | Nationstar [Member] | Original and Recaptured Pools [Member] | Minimum [Member]          
Investment [Line Items]          
Interest in Excess MSR 0.00%   0.00%    
Excess MSRs [Member] | Non-Agency [Member] | Nationstar [Member] | Original and Recaptured Pools [Member] | Maximum [Member]          
Investment [Line Items]          
Interest in Excess MSR 33.30%   33.30%    
Excess MSRs [Member] | Non-Agency [Member] | Nationstar [Member] | Recapture Agreements [Member] | Minimum [Member]          
Investment [Line Items]          
Interest in Excess MSR 0.00%   0.00%    
Excess MSRs [Member] | Non-Agency [Member] | Nationstar [Member] | Recapture Agreements [Member] | Maximum [Member]          
Investment [Line Items]          
Interest in Excess MSR 33.30%   33.30%    
Excess MSRs [Member] | Non-Agency [Member] | Nationstar [Member] | Ocwen Serviced Pools [Member]          
Investment [Line Items]          
Interest in Excess MSR 0.00%   0.00%