Market For Common Stock And Related Shareholder Matters (Price Ranges And Dividends Declared) (Details) (USD $)
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3 Months Ended | 12 Months Ended | |||||||
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Sep. 30, 2014
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Jun. 30, 2014
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Mar. 31, 2014
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2012
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Sep. 30, 2014
entity
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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]
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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]
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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 |