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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
INVENTORIES [Abstract]    
Raw Materials and Supplies $ 100,408 $ 98,252
Work in Process 41,454 35,100
Finished Goods 80,185 81,031
Inventory, Net $ 222,047 $ 214,383