Stock-Based Compensation (Stock Option Weighted-Average Assumptions Used In Determining Fair Values) (Details) - Employee Stock Option [Member] - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock price volatility	23.62%	24.67%	24.61%
Expected term	7 years 22 days	6 years 11 months 13 days	6 years 8 months 9 days
Risk-free interest rate	1.59%	2.16%	1.31%
Dividend yield	4.50%	4.75%	4.75%
Dividend payment per share	$ 3.34	$ 3.32	$ 3.32