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INVENTORIES (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Raw material $ 72,172 $ 85,490
Work-in-process 33,334 31,866
Finished goods 162,639 158,997
Inventory, Gross 268,145 276,353
Adjustment to LIFO basis (2,972) (6,562)
Inventory, Net $ 265,173 $ 269,791
Percentage of LIFO Inventory 8.00% 8.00%