Compensation Plans (Schedule of Assumptions Used in Determining Fair Value of Stock Options) (Details) - Stock Options [Member]	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	2.50%	2.90%	3.60%
Volatility	22.52%	31.33%	34.86%
Risk-free interest rate	1.40%	1.70%	1.00%
Expected life (years)	5 years 3 months 19 days	5 years 3 months 19 days	5 years 3 months 18 days