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Share-Based Compensation (Details 1)	3 Months Ended		9 Months Ended
Share-Based Compensation (Details 1)	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Stock options granted under the Company's option plans
Expected term (years)	5 years 9 months 6 days	5 years 9 months 6 days	5 years 11 months 6 days	5 years 9 months 6 days
Stock volatility	35.00%	36.00%	34.80%	36.10%
Risk free interest rates	1.70%	0.80%	1.40%	1.00%
Dividends during expected terms	2.20%	1.50%	1.80%	1.60%

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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