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Share-Based Compensation Arrangements (Details)	6 Months Ended
Share-Based Compensation Arrangements (Details)	Jun. 30, 2012	Jun. 30, 2011
Fair value of stock appreciation rights
Risk-free interest rate minimum	0.38%	1.17%
Risk-free interest rate maximum	0.63%	1.97%
Dividend yield	0.00%	0.00%
Share based compensation issued and earned	7 years
Volatility	66.50%	83.21%
Maximum [Member]
Fair value of stock appreciation rights
Share based compensation issued and earned	4 years 6 months	5 years 6 months
Minimum [Member]
Fair value of stock appreciation rights
Share based compensation issued and earned	2 years 8 months 12 days	3 years 8 months 12 days

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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