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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. 03, 2018
Jul. 04, 2017
Jul. 03, 2018
Jul. 04, 2017
Net Income Per Share        
Antidilutive securities excluded from calculation of basic earnings per share (in shares)     1,700 1,100
Net income per share, basic and diluted        
Net income $ 28,353 $ 38,166 $ 54,382 $ 73,209
Basic weighted average shares outstanding (in shares) 45,383 47,732 45,467 47,683
Dilutive effect of equity awards (in shares) 1,187 1,315 1,311 1,444
Diluted weighted average shares outstanding (in shares) 46,570 49,047 46,778 49,127
Basic net income per share (in dollars per share) $ 0.62 $ 0.80 $ 1.20 $ 1.54
Diluted net income per share (in dollars per share) $ 0.61 $ 0.78 $ 1.16 $ 1.49
Restricted Shares and Restricted Share Units        
Net Income Per Share        
Antidilutive securities excluded from calculation of basic earnings per share (in shares)     1,700 1,800