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INVENTORIES (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Raw material $ 134,140 $ 130,403
Work-in-process 53,465 54,190
Finished goods 214,530 208,821
Inventory, Gross 402,135 393,414
Adjustment to LIFO basis (7,585) (8,494)
Inventory, Net $ 394,550 $ 384,920
Percentage of LIFO Inventory 13.00% 12.00%