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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Inventories on a FIFO basis [Abstract]
Raw materials	$ 22,080	$ 18,727
Work in process	24,286	18,425
Finished manufactured goods	35,933	35,675
Total inventories	$ 82,299	$ 72,827

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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