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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Schedule of Available-for-sale Securities [Line Items]        
Other-than-temporary impairment $ 1,765 $ 1,574 $ 7,838 $ 3,294
Real estate securities acquired during the period with credit quality deterioration, face amount     2,121,300  
Real estate securities acquired during the period with credit quality deterioration, expected cash flows     2,131,500  
Real estate securities acquired during the period with credit quality deterioration, fair value     1,329,000  
Agency RMBS [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Face amount of securities sold, unsettled     1,400,000  
Face amount of securities purchased     1,200,000  
Proceeds from sale of AFS, unsettled     1,521,100  
Purchase of real estate securities, unsettled     1,300,000  
Non-Agency RMBS [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Face amount of securities sold, unsettled     27,000  
Purchase of real estate securities, unsettled     $ 20,700