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Net Income Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 30, 2013
Mar. 31, 2012
Earnings Per Share, Basic [Abstract]    
Net income, basic $ 44,006 $ 40,328
Weighted Average Number of Shares Outstanding, Basic 69,448,000 71,594,000
Net income per share - basic (in dollars per share) $ 0.63 $ 0.56
Dilutive stock options and restricted stock units outstanding, income 0 0
Dilutive stock options and restricted stock units outstanding, per share (in shares) 1,357,000 1,900,000
Dilutive stock options and restricted stock units outstanding, per share (in dollars per share) $ (0.01) $ (0.01)
Earnings Per Share, Diluted [Abstract]    
Weighted Average Number of Shares Outstanding, Diluted 70,805,000 73,494,000
Net income, dilutive $ 44,006 $ 40,328
Net income per share - diluted (in dollars per share) $ 0.62 $ 0.55
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 700,000 300,000