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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
INVENTORIES [Abstract]    
Raw Materials and Supplies $ 98,252 $ 97,969
Work in Process 35,100 34,973
Finished Goods 81,031 71,589
Inventory, Net $ 214,383 $ 204,531