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Net Income Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Apr. 02, 2013
Apr. 03, 2012
Net Income Per Share    
Shares of restricted stock issued to employees, unvested 1,400,000 1,000,000
Net income per share, basic and diluted    
Net income $ 25,292 $ 20,722
Basic weighted average shares outstanding 52,255,000 53,680,000
Dilutive effect of equity awards (in shares) 2,050,000 2,019,000
Diluted weighted average shares outstanding 54,305,000 55,699,000
Basic net income per share (in dollars per share) $ 0.48 $ 0.39
Diluted net income per share (in dollars per share) $ 0.47 $ 0.37
Shares of common stock not included in the diluted calculation due to their anti-dilutive effect 2,400,000 2,800,000