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Commercial Mortgage and Subordinate Loans, Net - Statistics for Loan Portfolio (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
loan
Dec. 31, 2016
USD ($)
loan
Mortgage Loans on Real Estate [Abstract]    
Number of loans | loan 59 45
Principal balance $ 3,706,169 $ 2,720,344
Carrying value 3,679,758 2,693,092
Unfunded loan commitments $ 435,627 $ 170,365
Weighted-average cash coupon 8.40% 8.88%
London Interbank Offered Rate (LIBOR) [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Basis spread on variable interest rate 1.56% 0.77%