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Commercial Mortgage and Subordinate Loans, Net - Loan Portfolio (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Carrying value $ 4,866,735 $ 3,679,758
Commercial Mortgage Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Carrying value 3,724,221 2,653,826
Subordinate Mortgage Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Carrying value $ 1,142,514 $ 1,025,932