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INVENTORIES (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Raw material $ 72,516 $ 85,490
Work-in-process 31,582 31,866
Finished goods 171,261 158,997
Inventory, Gross 275,359 276,353
Adjustment to LIFO basis (1,615) (6,562)
Inventory, Net $ 273,744 $ 269,791
Percentage of LIFO Inventory 7.00% 8.00%