Share-Based Compensation (Assumptions For Weighted Average Fair Value Of Stock Options) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Stock Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (years)	5 years 8 months 12 days	6 years 3 months 18 days	6 years	6 years
Risk-free interest rate	1.63%	1.71%	1.36%	1.69%
Expected volatility	37.96%	54.75%	48.90%	55.88%
Expected dividend yield	4.96%	5.03%	4.95%	3.99%
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (years)	3 months	3 months	3 months	3 months
Risk-free interest rate	0.02%	0.03%	0.03%	0.04%
Expected volatility	38.34%	43.37%	36.48%	43.29%
Expected dividend yield	4.91%	4.67%	4.96%	4.53%