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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. 27, 2016
Sep. 29, 2015
Sep. 27, 2016
Sep. 29, 2015
Net income per share        
Antidilutive securities excluded from calculation of basic earnings per share (in shares) 900 700 1,400 1,300
Net income per share, basic and diluted        
Net income $ 34,574 $ 26,176 $ 107,113 $ 89,323
Basic weighted average shares outstanding (in shares) 47,815 48,848 48,188 48,841
Dilutive effect of equity awards (in shares) 1,397 1,789 1,416 1,819
Diluted weighted average shares outstanding (in shares) 49,212 50,637 49,604 50,660
Basic net income per share (in dollars per share) $ 0.72 $ 0.54 $ 2.22 $ 1.83
Diluted net income per share (in dollars per share) $ 0.70 $ 0.52 $ 2.16 $ 1.76
Restricted stock        
Net income per share        
Antidilutive securities excluded from calculation of basic earnings per share (in shares)     1,900 1,900