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Share-Based Compensation Arrangements (Details)	9 Months Ended
Share-Based Compensation Arrangements (Details)	Sep. 30, 2012	Sep. 30, 2011
Fair value of stock appreciation rights
Expected life (years)	7 years
Maximum [Member]
Fair value of stock appreciation rights
Risk Free Interest Rate	0.49%	1.04%
Dividend yield	0.00%	0.00%
Expected life (years)	4 years 3 months	5 years 3 months
Minimum [Member]
Fair value of stock appreciation rights
Risk Free Interest Rate	0.25%	0.53%
Dividend yield	0.00%	0.00%
Expected life (years)	2 years 4 months	3 years 4 months
Volatility	65.55%	82.87%

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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