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Other Comprehensive Income (Loss) (Details) (USD $)
In Thousands, unless otherwise specified
Jul. 01, 2012
Dec. 31, 2011
Summary accumulated other comprehensive loss    
Unrealized gain on marketable securities $ 1,236 $ 1,685
Foreign currency translation adjustments (6,160) (6,807)
Accumulated other comprehensive loss (21,972) (22,170) [1]
US [Member]
    
Summary accumulated other comprehensive loss    
Employee benefit-related adjustments, net of tax (16,500) (16,500)
Mexico [Member]
    
Summary accumulated other comprehensive loss    
Employee benefit-related adjustments, net of tax $ (548) $ (548)
[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.