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Commercial Mortgage and Subordinate Loans, Net - Statistics for Loan Portfolio (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
loan
Dec. 31, 2017
USD ($)
loan
Receivables [Abstract]    
Number of loans | loan 69 59
Principal balance $ 4,982,514 $ 3,706,169
Carrying value 4,927,593 3,679,758
Unfunded loan commitments $ 1,095,598 $ 435,627
Weighted-average cash coupon 8.40% 8.40%