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Inventory (Details) (USD $)
In Thousands, unless otherwise specified
Jul. 01, 2012
Dec. 31, 2011
Reconciliation of Inventories    
Raw materials $ 25,752 $ 19,719
Work in process 15,730 13,093
Finished goods 5,033 7,451
Reserve for excess and obsolete inventory (7,027) (6,642)
Total inventory $ 39,488 $ 33,621 [1]
[1] The balance sheet at December 31,2011 has been derived from the audited consolidated financial statements at that date but does not include all information and footnotes required by accounting principles generally accepted in the United States for a complete set of financial statements.