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Distressed and Other Residential Mortgage Loans, At Fair Value - Components of Net Gain (Loss) on Residential Mortgages (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Abstract]        
Net realized gain on payoff and sale of loans $ 2,394 $ 330 $ 5,519 $ 369
Net unrealized gains (losses) $ 9,877 $ (233) $ 17,762 $ (439)