Annual report pursuant to Section 13 and 15(d)

FAIR VALUE OF FINANCIAL INSTRUMENTS - Recurring Fair Value Measurements (Details)

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FAIR VALUE OF FINANCIAL INSTRUMENTS - Recurring Fair Value Measurements (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Assets:    
Real estate securities, available-for-sale $ 2,294  
Carrying Value    
Assets:    
Real estate securities, available-for-sale 2,294 $ 629,254
Estimated Fair Value    
Assets:    
Real estate securities, available-for-sale 2,294 $ 629,254
Interest rate cap | Measured on a Recurring Basis | Carrying Value    
Assets:    
Derivative assets not treated as hedge 286  
Interest rate cap | Measured on a Recurring Basis | Estimated Fair Value    
Assets:    
Derivative assets not treated as hedge 286  
Interest rate cap | Measured on a Recurring Basis | Level 2 | Market Quotations (Unobservable) | Estimated Fair Value    
Assets:    
Derivative assets not treated as hedge 286  
Interest rate cap | Measured on a Recurring Basis | Level 3 | Market Quotations (Unobservable) | Estimated Fair Value    
Assets:    
Derivative assets not treated as hedge 0  
Interest rate cap | Measured on a Recurring Basis | Level 3 | Internal Pricing Models | Estimated Fair Value    
Assets:    
Derivative assets not treated as hedge 0  
ABS - Non-Agency RMBS | Measured on a Recurring Basis | Carrying Value    
Assets:    
Real estate securities, available-for-sale 2,294  
ABS - Non-Agency RMBS | Measured on a Recurring Basis | Estimated Fair Value    
Assets:    
Real estate securities, available-for-sale 2,294  
ABS - Non-Agency RMBS | Measured on a Recurring Basis | Level 2 | Market Quotations (Unobservable) | Estimated Fair Value    
Assets:    
Real estate securities, available-for-sale 0  
ABS - Non-Agency RMBS | Measured on a Recurring Basis | Level 3 | Market Quotations (Unobservable) | Estimated Fair Value    
Assets:    
Real estate securities, available-for-sale 0  
ABS - Non-Agency RMBS | Measured on a Recurring Basis | Level 3 | Internal Pricing Models | Estimated Fair Value    
Assets:    
Real estate securities, available-for-sale $ 2,294