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Net Income Per Common Share (Basic And Diluted Weighted Average Shares) (Details)
3 Months Ended 6 Months Ended
Jun. 27, 2014
Jun. 28, 2013
Jun. 27, 2014
Jun. 28, 2013
Net Income Per Common Share [Abstract]        
Basic weighted average common shares outstanding 28,939,096 30,532,021 29,029,300 30,411,897
Unvested restricted stock units and common stock subject to vesting requirements issued to employees and non-employees 1,035,202 1,707,857 887,477 1,435,012
Common stock issuable upon the exercise of stock options 9,496 11,175 9,471 15,104
Diluted weighted average common shares outstanding 29,983,794 32,251,053 29,926,248 31,862,013