Net Income Per Common Share (Reconciliation Of Basic And Diluted Weighted Average Shares) (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 28, 2018	Sep. 29, 2017	Sep. 28, 2018	Sep. 29, 2017
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding	29,478,243	28,764,661	29,332,508	28,891,301
Unvested restricted stock units and common stock subject to vesting requirements issued to employees and non-employees	684,045	928,103	507,508	1,008,159
Common stock issuable upon the exercise of stock options and SARs	2,431,071	2,264,901	2,374,403	2,354,767
Dilutive weighted average common shares outstanding	32,593,359	31,957,665	32,214,419	32,254,227