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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Inventory Disclosure [Abstract]
Raw material and subassemblies	$ 225,573	$ 185,359
Work-in-progress	55,886	48,788
Finished goods	54,592	69,009
Total inventories	$ 336,051	$ 303,156

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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