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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. 01, 2015
Jun. 25, 2014
Jul. 01, 2015
Jun. 25, 2014
Earnings Per Share [Abstract]        
Net income $ 9,734 $ 8,273 $ 18,267 $ 14,704
Weighted average shares outstanding - basic (in shares) 83,975 86,781 84,467 87,792
Effect of dilutive share-based compensation awards 2,105 1,603 2,080 1,838
Weighted average shares outstanding - diluted (in shares) 86,080 88,384 86,547 89,630
Basic net income per share $ 0.12 $ 0.10 $ 0.22 $ 0.17
Diluted net income per share $ 0.11 $ 0.09 $ 0.21 $ 0.16
Antidilutive share-based compensation awards (in shares) 0 606 0 606