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INVENTORIES (Details) - USD ($)
$ in Thousands
Mar. 31, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]    
Raw material $ 98,833 $ 119,989
Work-in-process 41,218 41,073
Finished goods 177,563 179,998
Inventory, Gross 317,614 341,060
Adjustment to LIFO basis (10,296) (9,628)
Inventory, Net $ 307,318 $ 331,432
Percentage of LIFO Inventory 10.00% 11.00%