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INVENTORIES (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]    
Raw material $ 87,359 $ 119,989
Work-in-process 38,608 41,073
Finished goods 167,302 179,998
Inventory, Gross 293,269 341,060
Adjustment to LIFO basis (6,134) (9,628)
Inventory, Net $ 287,135 $ 331,432
Percentage of LIFO Inventory 8.00% 11.00%