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Lease Obligations (Details Textual) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Capital Leases, Balance Sheet, Assets by Major Class, Net, Total $ 4,100 $ 5,000
Capital Lease Obligations, Current 1,109 1,085
Capital Lease Obligations $ 4,100 $ 4,900