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Note Receivable (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Note receivable $ 0 $ 8,098
Philadelphia Note    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Note receivable   $ 8,100
Interest rate   12.85%