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Net Income Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 25, 2013
Sep. 26, 2012
Sep. 25, 2013
Sep. 26, 2012
Earnings Per Share [Abstract]        
Net income $ 7,031 $ 5,363 $ 20,310 $ 15,829
Weighted average shares outstanding - basic (in shares) 90,035 94,705 91,348 95,472
Effect of dilutive share-based compensation awards 1,932 2,040 2,029 1,724
Weighted average shares outstanding - diluted (in shares) 91,967 96,745 93,377 97,196
Basic net income per share $ 0.08 $ 0.06 $ 0.22 $ 0.17
Diluted net income per share $ 0.08 $ 0.06 $ 0.22 $ 0.16
Antidilutive securities excluded from diluted weighted-average shares outstanding (in shares) 331 116 331 1,902