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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Inventories on a FIFO basis [Abstract]
Raw materials	$ 8,244	$ 7,483
Work in process	14,073	12,996
Finished manufactured goods	20,748	18,850
Total inventories	$ 43,065us-gaap_InventoryNet	$ 39,329us-gaap_InventoryNet

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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