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Net Income Per Common Share (Basic And Diluted Weighted Average Shares) (Details) - shares
 3 Months Ended 6 Months Ended
Jul. 03, 2015
Jun. 27, 2014
Jul. 03, 2015
Jun. 27, 2014
Net Income Per Common Share [Abstract]        
Basic weighted average common shares outstanding 28,717,622 28,939,096 28,634,644 29,029,300
Unvested restricted stock units and common stock subject to vesting requirements issued to employees and non-employees 1,490,490 1,035,202 1,169,221 887,477
Common stock issuable upon the exercise of stock options 680,378 9,496 599,039 9,471
Diluted weighted average common shares outstanding 30,888,490 29,983,794 30,402,904 29,926,248