Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS IN REAL ESTATE AND OTHER SECURITIES - Narrative (Details)

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INVESTMENTS IN REAL ESTATE AND OTHER SECURITIES - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Debt Securities, Available-for-sale [Line Items]        
Other-than-temporary impairment $ 8,859 $ 12,631 $ 16,375 $ 19,301
Real estate securities acquired with credit quality deterioration, face amount     380,500  
Real estate securities acquired with credit quality deterioration, expected cash flows     349,100  
Real estate securities acquired with credit quality deterioration, fair value     223,700  
Agency RMBS        
Debt Securities, Available-for-sale [Line Items]        
Face amount of securities sold, unsettled 5,100,000   5,100,000  
Face amount of securities purchased 300,000   300,000  
Proceeds from sale of AFS, unsettled 5,300,000   5,300,000  
Purchase of real estate securities, unsettled 300,000   300,000  
Non-Agency        
Debt Securities, Available-for-sale [Line Items]        
Face amount of securities sold, unsettled 21,600   21,600  
Purchase of real estate securities, unsettled $ 13,500   $ 13,500