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Loans, Held for Investment - Schedule of Loan Receivable Statistics (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
loan
Dec. 31, 2016
USD ($)
loan
Mortgage Loans on Real Estate [Abstract]    
Number of loans | loan 56 45
Principal balance $ 3,579,168 $ 2,720,344
Carrying Value 3,558,600 2,693,092
Unfunded loan commitments $ 80,164 $ 170,365
Weighted-average cash coupon 8.50% 8.88%
London Interbank Offered Rate (LIBOR) [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Basis spread on variable rate 1.23% 0.77%