Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS IN REAL ESTATE SECURITIES - Narrative (Details)

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INVESTMENTS IN REAL ESTATE SECURITIES - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Schedule of Available-for-sale Securities [Line Items]        
Other-than-temporary impairment $ 5,115 $ 2,819 $ 7,227 $ 6,073
Real estate securities acquired during the period with credit quality deterioration, face amount     2,057,100  
Real estate securities acquired during the period with credit quality deterioration, expected cash flows     1,855,000  
Real estate securities acquired during the period with credit quality deterioration, fair value     1,188,800  
Agency RMBS [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Face amount of securities sold, unsettled 2,600,000   2,600,000  
Face amount of securities purchased 1,700,000   1,700,000  
Proceeds from sale of AFS, unsettled 2,700,000   2,700,000  
Purchase of real estate securities, unsettled 1,800,000   1,800,000  
Non-Agency RMBS [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Face amount of securities sold, unsettled 23,700   23,700  
Purchase of real estate securities, unsettled $ 13,800   $ 13,800