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Long-Term Incentive Plan (Details) (USD $)	12 Months Ended
Long-Term Incentive Plan (Details) (USD $)	Dec. 31, 2010
Schedule of fair value option award granted
Weighted average grant date fair value	$ 4.78
Weighted average assumptions used:
Expected volatility	84.10%
Expected lives	5 years
Risk-free interest rates	2.62%
Expected dividend yields

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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