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Components of Inventories (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Inventories [Abstract]
Raw materials	$ 239,034	$ 212,027
Work in process	12,453	13,898
Finished goods	195,097	209,972
Supplies and materials	160,722	158,394
Inventories	$ 607,306	$ 594,291

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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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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 other supplies used within the manufacturing or production process expected to be consumed within one year or operating cycle, if longer.

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