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INVENTORIES (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Inventory Disclosure [Abstract]
Raw material	$ 119,989,000us-gaap_InventoryRawMaterials	$ 130,403,000us-gaap_InventoryRawMaterials
Work-in-process	41,073,000us-gaap_InventoryWorkInProcess	54,190,000us-gaap_InventoryWorkInProcess
Finished goods	179,998,000us-gaap_InventoryFinishedGoods	208,821,000us-gaap_InventoryFinishedGoods
Inventory, Gross	341,060,000us-gaap_InventoryGross	393,414,000us-gaap_InventoryGross
Adjustment to LIFO basis	(9,628,000)us-gaap_InventoryLIFOReserve	(8,494,000)us-gaap_InventoryLIFOReserve
Inventory, Net	331,432,000us-gaap_InventoryNet	384,920,000us-gaap_InventoryNet
Effect of LIFO Inventory Liquidation on Income	3,700,000us-gaap_EffectOfLIFOInventoryLiquidationOnIncome	3,100,000us-gaap_EffectOfLIFOInventoryLiquidationOnIncome
Mining inventory writedown	$ 16,690,000us-gaap_InventoryWriteDown	$ 0us-gaap_InventoryWriteDown	$ 0us-gaap_InventoryWriteDown

X

- Definition

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

+ References

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-Name Accounting Standards Codification

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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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