Net Income Per Common Share (Reconciliation Of Basic And Diluted Weighted Average Shares) (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 29, 2018	Jun. 30, 2017	Jun. 29, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding	29,429,925	29,041,291	29,259,641	28,954,621
Unvested restricted stock units and common stock subject to vesting requirements issued to employees and non-employees	469,702	1,105,875	420,020	1,046,173
Common stock issuable upon the exercise of stock options and SARs	2,335,458	2,365,435	2,345,288	2,401,714
Dilutive weighted average common shares outstanding	32,235,085	32,512,601	32,024,949	32,402,508