Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS IN REAL ESTATE AND OTHER SECURITIES - Additional Information (Details)

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INVESTMENTS IN REAL ESTATE AND OTHER SECURITIES - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Debt Securities, Available-for-sale [Line Items]        
Other-than-temporary impairment $ 12,631 $ 5,115 $ 19,301 $ 7,227
Real estate securities acquired with credit quality deterioration, face amount     877,600  
Real estate securities acquired with credit quality deterioration, expected cash flows     723,300  
Real estate securities acquired with credit quality deterioration, fair value     533,400  
Agency RMBS        
Debt Securities, Available-for-sale [Line Items]        
Face amount of securities sold, unsettled 1,100,000   1,100,000  
Face amount of securities purchased 1,100,000   1,100,000  
Proceeds from sale of AFS, unsettled 1,100,000   1,100,000  
Purchase of real estate securities, unsettled 1,100,000   1,100,000  
Non-Agency        
Debt Securities, Available-for-sale [Line Items]        
Face amount of securities sold, unsettled 40,800   40,800  
Purchase of real estate securities, unsettled $ 39,200   $ 39,200