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Note Receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Note receivable $ 8,098 $ 8,098
TIF Loan [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest rate   12.85%
Philadelphia Note [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Note receivable $ 8,100 $ 8,100