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Net Income Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Oct. 01, 2013
Sep. 30, 2014
Oct. 01, 2013
Net income per share        
Antidilutive securities excluded from calculation of basic earnings per share (in shares) 400,000 600,000 900,000 1,300,000
Net income per share, basic and diluted        
Net income $ 24,223 $ 27,481 $ 76,790 $ 81,356
Basic weighted average shares outstanding (in shares) 48,981,000 52,416,000 49,690,000 52,521,000
Dilutive effect of equity awards (in shares) 1,982,000 2,196,000 2,032,000 2,133,000
Diluted weighted average shares outstanding (in shares) 50,963,000 54,612,000 51,722,000 54,654,000
Basic net income per share (in dollars per share) $ 0.49 $ 0.52 $ 1.55 $ 1.55
Diluted net income per share (in dollars per share) $ 0.48 $ 0.50 $ 1.48 $ 1.49
Restricted Shares and Restricted Share Units
        
Net income per share        
Antidilutive securities excluded from calculation of basic earnings per share (in shares)     1,800,000 1,600,000