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Shareholders' Equity (Summary Of Stock Appreciation Rights Activity) (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Outstanding-beginning of the year, Number of options 1,635,305 1,858,250 2,454,851
Outstanding-beginning of the year, Weighted average exercise price $ 35.96 $ 35.24 $ 33.96
Granted, Number of options 63,300 28,000 58,500
Granted, Weighted average exercise price $ 50.74 $ 52.23 $ 50.33
Outstanding-end of the year, Number of options 1,450,890 1,635,305 1,858,250
Outstanding-end of the year, Weighted average exercise price $ 37.07 $ 35.96 $ 35.24
Options exercisable at the end of the year, Number of options 1,292,806 963,289 586,626
Rights vested at the end of the year, Weighted average exercise price $ 35.17 $ 34.70 $ 32.55
Stock Appreciation Rights (SARs) [Member]
      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Granted, Number of options       
Granted, Weighted average exercise price       
Outstanding-end of the year, Number of options 30,000    
Outstanding-end of the year, Weighted average exercise price $ 58.64    
Options exercisable at the end of the year, Number of options 20,250    
Rights vested at the end of the year, Weighted average exercise price $ 59.36