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Net Inventories (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Inventory, Net [Abstract]
Finished goods	$ 31,642	$ 29,797
Work in process	39,037	31,990
Raw materials	22,589	22,580
Supplies	5,470	5,598
Total	$ 98,738	$ 89,965

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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