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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Inventory [Line Items]    
Inventory, Raw Materials, Gross $ 65,719 $ 76,680
Inventory, Work in Process, Gross 31,576 33,721
Inventory, Finished Goods, Gross 72,388 88,901
Inventories, net 169,683 199,302
Inventory Valuation Reserves $ 10,069 $ 11,269