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INVENTORIES (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Jun. 30, 2014	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Inventory Disclosure [Abstract]
Raw material		$ 122,256		$ 130,403
Work-in-process		55,225		54,190
Finished goods		208,327		208,821
Inventory, Gross		385,808		393,414
Adjustment to LIFO basis		(10,541)		(8,494)
Inventory, Net		375,267		384,920
Percentage of LIFO Inventory		11.00%		12.00%
Mining inventory writedown	$ 11,555	$ 11,555	$ 0

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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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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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Amount of difference between inventory at lower of LIFO cost or market and inventory at lower of other inventory accounting method cost or market, for example, but not limited to, FIFO or average cost.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

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

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Charge to cost of goods sold that represents the reduction of the carrying amount of inventory, generally attributable to obsolescence or market conditions.

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The percentage of LIFO (last in first out) inventory to total inventory as of the balance sheet date if other than 100 percent.

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