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		6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014	Jul. 04, 2015	Jun. 28, 2014
Common Stock And Earnings Per Share [Abstract]
Net earnings available to common shareholders	$ 25,416	$ 19,301	$ 45,096	$ 35,838
Weighted average common shares outstanding during period - basic	12,740	13,768	12,694	13,843
Dilutive effect of in-the-money equity awards	485	467	461	472
Weighted average common shares outstanding during period - diluted	13,225	14,235	13,155	14,315
Earnings per common share from net earnings - basic	$ 1.99	$ 1.40	$ 3.55	$ 2.59
Earnings per common share from net earnings - diluted	$ 1.92	$ 1.36	$ 3.43	$ 2.50
Equity awards for the following shares were not included in the their effect would be anti-dilutive:	102	383	113	328