Stock Based Compensation (Assumptions Used To Determine Fair Value of Stock Options) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stock Based Compensation [Abstract]
Grant date fair value	$ 4.42	$ 4.01	$ 4.42
Expected life of options	8 years	8 years	8 years
Risk-free interest rate	1.30%	1.40%	2.16%
Dividend yield rate	2.80%	2.83%	2.65%
Price volatility	28.51%	28.56%	28.86%