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Stock Compensation (Schedule Of Weighted-Average Assumptions Used To Determine The Fair Value Of Options) (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected life of options   2 years 9 months 26 days 4 years 9 months 4 years 5 months 19 days
Expected stock price volatility   0.37% 40.00% 0.44%
Dividends   1.17%   1.10%
Risk-free interest rate   0.78% 1.20% 1.40%
ESPP Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected life of options 6 months 6 months 6 months 6 months
Expected stock price volatility 30.00% 0.34% 30.00% 0.34%
Dividends   1.06%   1.06%
Risk-free interest rate 0.49% 0.12% 0.49% 0.12%