Share-Based Compensation Option Assumptions (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock options granted under the Company's option plans
Expected term	5 years 10 months 29 days	5 years 9 months 22 days	5 years 8 months 16 days
Stock volatility	34.50%	36.60%	40.40%
Risk free interest rates	1.60%	1.00%	1.70%
Dividends during expected terms	1.90%	1.60%	1.40%