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Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jul. 04, 2017
Jun. 28, 2016
Jul. 04, 2017
Jun. 28, 2016
Net Income Per Share        
Antidilutive securities excluded from calculation of basic earnings per share (in shares)     1,100 1,800
Net income per share, basic and diluted        
Net income $ 38,166 $ 38,585 $ 73,209 $ 72,539
Basic weighted average shares outstanding (in shares) 47,732 48,232 47,683 48,375
Dilutive effect of equity awards (in shares) 1,315 1,366 1,444 1,439
Diluted weighted average shares outstanding (in shares) 49,047 49,598 49,127 49,814
Basic net income per share (in dollars per share) $ 0.80 $ 0.80 $ 1.54 $ 1.50
Diluted net income per share (in dollars per share) $ 0.78 $ 0.78 $ 1.49 $ 1.46