Net Income Per Common Share (Basic And Diluted Weighted Average Shares) (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jul. 01, 2016	Jun. 30, 2017	Jul. 01, 2016
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding	29,041,291	29,285,379	28,954,621	29,587,570
Unvested restricted stock units and common stock subject to vesting requirements issued to employees and non-employees	1,105,875	1,313,015	1,046,173	1,254,772
Common stock issuable upon the exercise of stock options and SARs	2,365,435	2,283,582	2,401,714	2,275,239
Dilutive weighted average common shares outstanding	32,512,601	32,881,976	32,402,508	33,117,581