Quarterly report pursuant to Section 13 or 15(d)

Common Stock And Earnings Per Share (Details)

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Common Stock And Earnings Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 29, 2013
Jun. 30, 2012
Jun. 29, 2013
Jun. 30, 2012
Dec. 29, 2012
Dec. 31, 2011
Common Stock And Earnings Per Share [Abstract]            
Net earnings available to common shareholders $ 24,210 $ 16,745 $ 41,989 $ 30,496    
Common shares outstanding entire period 13,591   13,591   13,821 14,940
Weighted average common shares issued during period 106 68 58 45    
Weighted average common shares cancelled during period (414) (317) (301) (158)    
Weighted average common shares outstanding during period 13,513 14,691 13,578 14,827    
Earnings per common share from net earnings - basic $ 1.79 $ 1.14 $ 3.09 $ 2.06    
Weighted average common shares outstanding during period - basic 13,513 14,691 13,578 14,827    
Dilutive effect of in-the-money equity awards 586 399 456 365    
Weighted average common shares outstanding during period - diluted 14,099 15,090 14,034 15,192    
Earnings per common share from net earnings - diluted $ 1.72 $ 1.11 $ 2.99 $ 2.01    
Equity awards of stock excluded in computation of diluted EPS 234 1,906 560 1,934