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Net Income Per Common Share (Basic And Diluted Weighted Average Shares) (Details)
3 Months Ended 9 Months Ended
Sep. 26, 2014
Sep. 27, 2013
Sep. 26, 2014
Sep. 27, 2013
Net Income Per Common Share [Abstract]        
Basic weighted average common shares outstanding 28,557,528 30,626,838 28,872,043 30,483,544
Unvested restricted stock units and common stock subject to vesting requirements issued to employees and non-employees 1,232,971 2,159,234 1,002,642 1,676,932
Common stock issuable upon the exercise of stock options 9,826 10,572 9,589 13,392
Diluted weighted average common shares outstanding 29,800,325 32,796,644 29,884,274 32,173,868