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Distressed and Other Residential Mortgage Loans, At Fair Value - Differences Between Fair Value and Aggregate Unpaid Principal (Details) - 90 days past due - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Fair Value $ 49,284 $ 60,117
Unpaid Principal Balance $ 60,858 $ 75,167