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Inventories Inventories (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Inventory Disclosure [Abstract]
Raw material and subassemblies	$ 231,722	$ 225,573
Work-in-progress	59,810	55,886
Finished goods	59,700	54,592
Total inventories	$ 351,232	$ 336,051

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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