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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
INVENTORIES [Abstract]    
Raw Materials and Supplies $ 118,790 $ 100,408
Work in Process 43,035 41,454
Finished Goods 93,565 80,185
Inventory, Net $ 255,390 $ 222,047