Common Stock And Earnings Per Share (Schedule Of Common Stock And Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 03, 2015	Sep. 27, 2014	Oct. 03, 2015	Sep. 27, 2014
Common Stock And Earnings Per Share [Abstract]
Net earnings available to common shareholders	$ 25,609	$ 19,498	$ 70,705	$ 55,336
Weighted average common shares outstanding during period - basic	12,852	12,873	12,747	13,520
Dilutive effect of in-the-money equity awards	465	390	462	444
Weighted average common shares outstanding during period - diluted	13,317	13,263	13,209	13,964
Earnings per common share from net earnings - basic	$ 1.99	$ 1.51	$ 5.55	$ 4.09
Earnings per common share from net earnings - diluted	$ 1.92	$ 1.47	$ 5.35	$ 3.96
Equity awards for the following shares were not included in the their effect would be anti-dilutive:	361	414	196	357