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Share Based Compensation (Details)	6 Months Ended
Share Based Compensation (Details)	Jun. 30, 2012
Fair value of options granted determined by using weighted-average assumptions
Risk free interest rate	1.27%
Dividend yield	3.38%
Volatility	33.00%

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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