Share-Based Compensation (Assumptions For Employee Stock Purchase Plan) (Details)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	1.50%	1.30%
Weighted average expected life in years	6 years	6 years 9 months 17 days
Expected volatility	38.90%	39.20%
Dividend yield	2.80%	3.60%
ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	0.24%	0.19%
Weighted average expected life in years	1 year	1 year
Expected volatility	27.60%	36.50%
Dividend yield	2.80%	3.60%