Quarterly report pursuant to Section 13 or 15(d)

Common Stock And Earnings Per Share (Schedule Of Common Stock And Earnings Per Share) (Details)

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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 9 Months Ended
Sep. 28, 2013
Sep. 29, 2012
Sep. 28, 2013
Sep. 29, 2012
Dec. 29, 2012
Dec. 31, 2011
Common Stock And Earnings Per Share [Abstract]            
Net earnings available to common shareholders $ 16,753 $ 17,490 $ 58,742 $ 47,986    
Common shares outstanding entire period 13,860   13,860   13,821 14,940
Weighted average common shares issued during period 344 229 154 107    
Weighted average common shares cancelled during period (414) (804) (339) (374)    
Weighted average common shares outstanding during period 13,751 14,365 13,636 14,673    
Earnings per common share from net earnings - basic $ 1.22 $ 1.22 $ 4.31 $ 3.27    
Weighted average common shares outstanding during period - basic 13,751 14,365 13,636 14,673    
Dilutive effect of in-the-money equity awards 642 519 496 391    
Weighted average common shares outstanding during period - diluted 14,393 14,884 14,132 15,064    
Earnings per common share from net earnings - diluted $ 1.16 $ 1.18 $ 4.16 $ 3.19