Share-Based Compensation Share-Based Compensation (Average Fair Value of Stock Options Granted, Assumptions) (Details)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Dividend yield	1.60%	1.33%
Volatility	42.15%	43.60%
Risk-free rate of return	0.85%	0.92%
Expected life, in years	5 years 1 month 0 days	5 years 1 month 0 days