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. 01, 2016	Oct. 03, 2015	Oct. 01, 2016	Oct. 03, 2015
Common Stock And Earnings Per Share [Abstract]
Net earnings available to common shareholders	$ 30,098	$ 25,609	$ 78,159	$ 70,705
Weighted average common shares outstanding - basic	12,089	12,852	12,056	12,747
Dilutive effect of in-the-money equity awards	436	465	469	462
Weighted average common shares outstanding - diluted	12,525	13,317	12,525	13,209
Earnings per common share from net earnings - basic	$ 2.49	$ 1.99	$ 6.48	$ 5.55
Earnings per common share from net earnings - diluted	$ 2.40	$ 1.92	$ 6.24	$ 5.35
Equity awards for the following shares were not included in the computation of diluted EPS due to the fact that their effect would be anti-dilutive:	1,154	361	1,118	196