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Inventories, Net - Components of Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Finished goods $ 79,226 $ 73,027
Work in process 15,447 14,719
Raw materials and supplies 88,895 87,047
Inventory, Net $ 183,568 $ 174,793