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Market For Common Stock And Related Shareholder Matters (Price Ranges And Dividends Declared) (Details) (USD $)
3 Months Ended 12 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2014
entity
Class of Stock [Line Items]                  
Number of common stock shareholders                 12,654
Dividends Declared $ 0.385 $ 0.385 $ 0.375 $ 0.375 $ 0.375 $ 0.375 $ 0.365 $ 0.365  
High [Member]
                 
Class of Stock [Line Items]                  
Price Range $ 78.79 $ 78.46 $ 77.05 $ 72.53 $ 69.27 $ 64.58 $ 61.44 $ 55.66 $ 78.79
Low [Member]
                 
Class of Stock [Line Items]                  
Price Range $ 65.29 $ 68.50 $ 68.12 $ 65.23 $ 57.52 $ 56.80 $ 48.51 $ 49.00 $ 65.29