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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Inventories on a FIFO basis [Abstract]
Raw materials	$ 14,482	$ 15,731
Work in process	14,769	13,168
Finished manufactured goods	29,274	32,293
Total inventories	$ 58,525	$ 61,192

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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