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Mortgage Notes Receivable - Schedule of Mortgage Notes Receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Carrying Value $ 20,294 $ 22,764
Mortgage notes receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding Balance 22,496  
Carrying Value $ 20,294 $ 1,500
Mortgage notes receivable [Member] | Minimum [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate Range 5.90%  
Mortgage notes receivable [Member] | Maximum [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate Range 6.80%