Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS IN REAL ESTATE AND OTHER SECURITIES - Summary of the Geographic Distribution of the Collateral Securing Non-Agency RMBS (Details)

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INVESTMENTS IN REAL ESTATE AND OTHER SECURITIES - Summary of the Geographic Distribution of the Collateral Securing Non-Agency RMBS (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Non-Agency    
Debt Securities, Available-for-sale [Line Items]    
Outstanding Face Amount $ 20,901,135 $ 19,397,604
Percentage of Total Outstanding 100.00% 100.00%
Non-Agency | Western U.S.    
Debt Securities, Available-for-sale [Line Items]    
Outstanding Face Amount $ 8,109,480 $ 7,318,616
Percentage of Total Outstanding 38.80% 37.70%
Non-Agency | Southeastern U.S.    
Debt Securities, Available-for-sale [Line Items]    
Outstanding Face Amount $ 4,961,126 $ 4,613,314
Percentage of Total Outstanding 23.70% 23.80%
Non-Agency | Northeastern U.S.    
Debt Securities, Available-for-sale [Line Items]    
Outstanding Face Amount $ 4,333,893 $ 3,829,725
Percentage of Total Outstanding 20.70% 19.70%
Non-Agency | Midwestern U.S.    
Debt Securities, Available-for-sale [Line Items]    
Outstanding Face Amount $ 2,112,686 $ 2,063,263
Percentage of Total Outstanding 10.10% 10.60%
Non-Agency | Southwestern U.S.    
Debt Securities, Available-for-sale [Line Items]    
Outstanding Face Amount $ 1,361,941 $ 1,321,853
Percentage of Total Outstanding 6.60% 6.80%
Non-Agency | Other U.S.    
Debt Securities, Available-for-sale [Line Items]    
Outstanding Face Amount $ 22,009 $ 250,833
Percentage of Total Outstanding 0.10% 1.40%
Consumer Loan | Bonds    
Debt Securities, Available-for-sale [Line Items]    
Face amount of investment $ 49,600 $ 56,800
Corporate Loan | Bonds    
Debt Securities, Available-for-sale [Line Items]    
Face amount of investment $ 85,000 $ 85,000