Common Stock And Earnings Per Share (Schedule Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Common Stock And Earnings Per Share [Abstract]
Net earnings available to common shareholders	$ 31,040	$ 23,769	$ 93,893	$ 68,386
Weighted average common shares outstanding - basic	24,269	24,283	24,179	24,462
Dilutive effect of in-the-money equity awards	732	305	526	409
Weighted average common shares outstanding - diluted	25,001	24,588	24,705	24,871
Earnings per common share from net earnings - basic	$ 1.28	$ 0.98	$ 3.88	$ 2.80
Earnings per common share from net earnings - diluted	$ 1.24	$ 0.97	$ 3.80	$ 2.75