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Commercial Mortgage and Subordinate Loans, Net - Statistics for Loan Portfolio (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
loan
Dec. 31, 2017
USD ($)
loan
Mortgage Loans on Real Estate [Abstract]    
Number of loans | loan 63 59
Principal balance $ 4,099,372 $ 3,706,169
Carrying value 4,067,494 3,679,758
Unfunded loan commitments $ 852,508 $ 435,627
Weighted-average cash coupon 8.60% 8.40%