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Stock-Based Compensation Expense (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 6 Months Ended
Jul. 01, 2012
Stock option activity  
Outstanding as of December 31, 2011, Shares 4,473
Outstanding as of December 31, 2011, Weighted-Average Exercise Price $ 24.48
Granted, Shares 17
Granted, Weighted-Average Exercise Price $ 41.40
Exercised, Shares (654)
Exercised, Weighted-Average Exercise Price $ 21.33
Forfeited or expired, Shares (81)
Forfeited or expired, Weighted-Average Exercise Price $ 24.89
Outstanding as of July 1, 2012, Shares 3,755
Outstanding as of July 1, 2012, Weighted-Average Exercise Price $ 25.15
Outstanding as of July 1, 2012, Weighted-Average Remaining Contractual Term (in years) 7 years 6 months
Outstanding as of July 1, 2012, Aggregate Intrinsic Value $ 26,464
Exercisable as of July 1, 2012, Shares 1,347
Exercisable as of July 1, 2012, Weighted-Average Exercise Price $ 20.90
Exercisable as of July 1, 2012, Weighted-Average Remaining Contractual Term (in years) 5 years 9 months 18 days
Exercisable as of July 1, 2012, Aggregate Intrinsic Value $ 14,648