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Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 29, 2015
Sep. 30, 2014
Sep. 29, 2015
Sep. 30, 2014
Net income per share        
Antidilutive securities excluded from calculation of basic earnings per share (in shares) 700 400 1,300 900
Net income per share, basic and diluted        
Net income $ 26,176 $ 24,223 $ 89,323 $ 76,790
Basic weighted average shares outstanding (in shares) 48,848 48,981 48,841 49,690
Dilutive effect of equity awards (in shares) 1,789 1,982 1,819 2,032
Diluted weighted average shares outstanding (in shares) 50,637 50,963 50,660 51,722
Basic net income per share (in dollars per share) $ 0.54 $ 0.49 $ 1.83 $ 1.55
Diluted net income per share (in dollars per share) $ 0.52 $ 0.48 $ 1.76 $ 1.48
Restricted stock        
Net income per share        
Antidilutive securities excluded from calculation of basic earnings per share (in shares)     1,900 1,800