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Other Comprehensive Income (Loss) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Summary accumulated other comprehensive loss    
Unrealized gain on marketable securities $ 0 $ 1,685
Foreign currency translation adjustments (4,256) (6,807)
Accumulated other comprehensive loss (21,304) (22,170)
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)