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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 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Abstract]        
Net realized gains on payoff and sale of loans $ 1,658 $ 1,127 $ 7,177 $ 1,496
Net unrealized gains (losses) $ 16,818 $ (484) $ 34,580 $ (923)