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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Short-term inventories:
Raw materials	$ 54,094	$ 56,913
Work-in-process	6,452	10,157
Finished goods	52,190	43,374
Supplies	3,109	3,101
Total short-term inventories	115,845	113,545
Long-term inventories:
Finished goods	1,463	1,608
Total inventories	$ 117,308	$ 115,153

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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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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