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Property, Plant and Equipment (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]      
Depreciation, Depletion and Amortization, Nonproduction $ 15,689 $ 12,765 $ 13,312