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Certain Balance Sheet Components Inventories (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Inventories [Line Items]
Materials	$ 102,654	$ 92,038
Work in process	11,846	12,568
Finished goods	67,954	66,113
Total inventories	$ 182,454	$ 170,719

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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