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Net Income Per Common Share (Basic And Diluted Weighted Average Shares) (Details)
3 Months Ended 9 Months Ended
Sep. 27, 2013
Sep. 28, 2012
Sep. 27, 2013
Sep. 28, 2012
Net Income Per Common Share [Abstract]        
Basic weighted average common shares outstanding 30,626,838 29,400,901 30,483,544 32,405,052
Unvested restricted stock units and common stock subject to vesting requirements issued to employees and non-employees 2,159,234 2,057,492 1,676,932 1,858,667
Common stock issuable upon the exercise of stock options 10,572 30,246 13,392 48,171
Diluted weighted average common shares outstanding 32,796,644 31,488,639 32,173,868 34,311,890