Market For Common Stock And Related Shareholder Matters (Price Ranges And Dividends Declared) (Details)	3 Months Ended								12 Months Ended
	Sep. 30, 2015 $ / shares	Jun. 30, 2015 $ / shares	Mar. 31, 2015 $ / shares	Dec. 31, 2014 $ / shares	Sep. 30, 2014 $ / shares	Jun. 30, 2014 $ / shares	Mar. 31, 2014 $ / shares	Dec. 31, 2013 $ / shares	Sep. 30, 2015 entity $ / shares
Class of Stock [Line Items]
Number of common stock shareholders | entity									12,147
Dividends Declared	$ 0.395	$ 0.395	$ 0.385	$ 0.385	$ 0.385	$ 0.385	$ 0.375	$ 0.375
High [Member]
Class of Stock [Line Items]
Price Range	59.39	66.07	70.19	72.21	78.79	78.46	77.05	72.53	$ 59.39
Low [Member]
Class of Stock [Line Items]
Price Range	$ 48.61	$ 58.83	$ 57.73	$ 64.31	$ 65.29	$ 68.50	$ 68.12	$ 65.23	$ 48.61