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Subsequent Events - Mortgage Notes Receivable (Details)
$ in Thousands
Oct. 24, 2018
USD ($)
loan
Sep. 30, 2018
USD ($)
loan
Dec. 31, 2017
USD ($)
Subsequent Event [Line Items]      
Net Carrying Value   $ 18,757 $ 20,294
Mortgage notes receivable [Member]      
Subsequent Event [Line Items]      
Number of mortgage notes receivable | loan   8  
Net Carrying Value   $ 18,757  
Mortgage notes receivable [Member] | Subsequent Event [Member]      
Subsequent Event [Line Items]      
Number of mortgage notes receivable | loan 1    
Net Carrying Value $ 2,400    
Gross sales price of mortgage notes receivable $ 2,600