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. 30, 2012
Jul. 02, 2011
Jun. 30, 2012
Jul. 02, 2011
Dec. 31, 2011
Jan. 01, 2011
Common Stock And Earnings Per Share [Abstract]            
Net earnings available to common shareholders $ 16,745 $ 13,856 $ 30,496 $ 25,206    
Common shares outstanding entire period 14,350   14,350   14,940 15,985
Weighted average common shares issued during period 68 13 45 8    
Weighted average common shares repurchased and retired during period (317) (468) (158) (273)    
Weighted average common shares outstanding during period 14,691 15,530 14,827 15,720    
Earnings per common share from net earnings - basic $ 1.14 $ 0.89 $ 2.06 $ 1.60    
Weighted average common shares outstanding during period - basic 14,691 15,530 14,827 15,720    
Dilutive effect of in-the-money equity awards 399 222 365 244    
Weighted average common shares outstanding during period - diluted 15,090 15,752 15,192 15,964    
Earnings per common share from net earnings - diluted $ 1.11 $ 0.88 $ 2.01 $ 1.58    
Equity awards of stock excluded in computation of diluted EPS 1,906 2,782 1,934 2,782