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Net Income Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jul. 02, 2013
Jul. 03, 2012
Jul. 02, 2013
Jul. 03, 2012
Net Income Per Share        
Shares of restricted stock issued to employees, unvested 1,500,000 1,100,000 1,500,000 1,100,000
Net income per share, basic and diluted        
Net income $ 28,583 $ 28,399 $ 53,875 $ 49,121
Basic weighted average shares outstanding 52,892,000 53,155,000 52,574,000 53,417,000
Dilutive effect of equity awards (in shares) 2,181,000 1,936,000 2,118,000 1,959,000
Diluted weighted average shares outstanding 55,073,000 55,091,000 54,692,000 55,376,000
Basic net income per share (in dollars per share) $ 0.54 $ 0.53 $ 1.02 $ 0.92
Diluted net income per share (in dollars per share) $ 0.52 $ 0.52 $ 0.99 $ 0.89
Shares of common stock not included in the diluted calculation due to their anti-dilutive effect 500,000 2,700,000 1,100,000 2,900,000