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INVENTORIES (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Inventory Disclosure [Abstract]    
Raw material $ 104,068 $ 97,257
Work-in-process 43,907 31,141
Finished goods 110,243 75,137
Inventory, Gross 258,218 203,535
Adjustment to LIFO basis (10,440) (12,663)
Inventory, Net $ 247,778 $ 190,872
Percentage of LIFO Inventory 23.00% 30.00%