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Lease Obligations (Details Textual) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Capital Leases, Balance Sheet, Assets by Major Class, Net, Total $ 3,200 $ 3,700
Capital Lease Obligations, Current 1,102 1,086
Capital Lease Obligations $ 3,100 $ 3,700