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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Inventory [Line Items]    
Raw materials and supplies $ 72,692 $ 65,719
Work in process 33,369 31,576
Finished goods 78,230 72,388
Inventories, net 184,291 169,683
Inventory Valuation Reserves $ 9,370 $ 10,069