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Significant Accounting Policies (Schedule Of Employee Stock Options On Estimated Weighted Average Assumptions) (Details)
 12 Months Ended
Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Significant Accounting Policies [Abstract]      
Dividend yield 2.45% 2.23% 2.20%
Expected volatility 36.07% 31.59% 31.92%
Risk-free interest rate 0.83% 2.01% 1.56%
Expected life, years 4 years 4 years 4 years
Forfeiture rate 0.56% 0.56% 0.56%
Suboptimal factor 1.75 1.75 1.75