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Inventory (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Inventory
Raw Materials	$ 43,745	$ 41,642
Work In Process	22,485	15,810
Finished Goods	7,179	6,932
Total	$ 73,409	$ 64,384

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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