Common Stock And Earnings Per Share (Schedule Of Common Stock And Earnings Per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013	Dec. 28, 2013	Dec. 29, 2012
Common Stock And Earnings Per Share [Abstract]
Net earnings available to common shareholders	$ 16,537	$ 17,779
Common shares outstanding entire period	13,981		13,886	13,821
Weighted average common shares issued during period	33	10
Weighted average common shares cancelled during period		(188)
Weighted average common shares outstanding during period	13,919	13,643
Earnings per common share from net earnings - basic	$ 1.19	$ 1.30
Weighted average common shares outstanding during period - basic	13,919	13,643
Dilutive effect of in-the-money equity awards	476	260
Weighted average common shares outstanding during period - diluted	14,395	13,903
Earnings per common share from net earnings - diluted	$ 1.15	$ 1.28