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Stock-Based Compensation (Summary Information For Incentive Stock Awards And Restricted Stock Awards) (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Incentive Compensation Awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Awards, January 1, 2011 28,692    
Number of Awards, Awarded 16,814    
Number of Awards, Distributed (13,806)    
Number of Awards, December 31, 2011 31,700 28,692  
Weighted-Average Grant-Date Fair Value, January 1, 2011 $ 79.24    
Weighted-Average Grant-Date Fair Value, Awarded $ 84.71 $ 79.78 $ 81.75
Weighted-Average Grant-Date Fair Value, Distributed $ 81.78    
Weighted-Average Grant-Date Fair Value, December 31, 2011 $ 81.04 $ 79.24  
Restricted Stock Awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Awards, January 1, 2011 390,220    
Number of Awards, Awarded 46,558    
Number of Awards, Distributed (125,978)    
Number of Awards, Forfeited (5,712)    
Number of Awards, December 31, 2011 305,088 390,220  
Weighted-Average Grant-Date Fair Value, January 1, 2011 $ 107.27    
Weighted-Average Grant-Date Fair Value, Awarded $ 86.90 $ 91.33 $ 80.29
Weighted-Average Grant-Date Fair Value, Distributed $ 128.01    
Weighted-Average Grant-Date Fair Value, Forfeited $ 100.87    
Weighted-Average Grant-Date Fair Value, December 31, 2011 $ 95.72 $ 107.27