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 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Debt Securities, Available-for-sale [Line Items]        
Other-than-temporary impairment $ 5,567 $ 3,889 $ 21,942 $ 23,190
Real estate securities acquired with credit quality deterioration, face amount     496,200  
Real estate securities acquired with credit quality deterioration, expected cash flows     481,000  
Real estate securities acquired with credit quality deterioration, fair value     290,500  
Agency RMBS        
Debt Securities, Available-for-sale [Line Items]        
Face amount of securities sold, unsettled 4,300,000   4,300,000  
Face amount of securities purchased 2,500,000   2,500,000  
Proceeds from sale of AFS, unsettled 4,400,000   4,400,000  
Purchase of real estate securities, unsettled $ 2,500,000   $ 2,500,000