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INVENTORIES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Inventory Disclosure [Abstract]
Raw material	$ 119,989	$ 130,403
Work-in-process	41,073	54,190
Finished goods	179,998	208,821
Inventory, Gross	341,060	393,414
Adjustment to LIFO basis	(9,628)	(8,494)
Inventory, Net	331,432	384,920
Effect of LIFO Inventory Liquidation on Income	3,700	3,100
Mining inventory writedown	$ 16,690	$ 0	$ 0

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The effect of liquidating LIFO (last in first out) inventory layers on income.

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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