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Lease Obligations (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Capital Leases, Balance Sheet, Assets by Major Class, Net, Total $ 3,700 $ 5,000  
Capital Lease Obligations, Current 1,086 1,085  
Capital Lease Obligations 3,700    
Operating Leases, Rent Expense, Net $ 44,600 $ 44,900 $ 57,200