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Stock Compensation Plans (Details)	3 Months Ended
Stock Compensation Plans (Details)	Mar. 31, 2013
Share based compensation arrangement by share based payment award fair value assumptions and methodology
Expected term (years)	6 years 3 months
Interest rate	1.04%
Volatility	46.87%
Dividend yield	0.00%

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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