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Share-based Compensation (Details) (USD $)	9 Months Ended
Share-based Compensation (Details) (USD $)	Sep. 30, 2012
The grant date fair value for the PSUs containing the RTSR market-based performance using a Monte Carlo simulation
Expected volatility	85.00%
Risk-free interest rate	0.40%
Expected life (in years)	2 years 9 months 22 days
Expected dividend yield

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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