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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. 30, 2015
Sep. 24, 2014
Sep. 30, 2015
Sep. 24, 2014
Earnings Per Share [Abstract]        
Net income $ 8,950 $ 8,343 $ 27,217 $ 23,047
Weighted average shares outstanding - basic (in shares) 82,923 85,061 83,952 86,882
Effect of dilutive share-based compensation awards 2,133 1,922 2,115 1,962
Weighted average shares outstanding - diluted (in shares) 85,056 86,983 86,067 88,844
Basic net income per share $ 0.11 $ 0.10 $ 0.32 $ 0.27
Diluted net income per share $ 0.11 $ 0.10 $ 0.32 $ 0.26
Antidilutive share-based compensation awards (in shares) 0 252 0 549