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Shareholders' Equity (Details 5) (SARs granted [Member], USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
SARs granted [Member]
Weighted average fair value of SARs granted
Dividend yield	0.00%	0.00%
Risk-free interest rate	0.78%	1.39%
Volatility	86.90%	89.50%
Expected term (years)	5 years	4 years 6 months
Weighted-average fair value of SARs granted	$ 1.26	$ 3.98

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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