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SHARE-BASED COMPENSATION AND SHAREHOLDERS' EQUITY - Summary of weighted average assumptions (Details 2) (Stock Options)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	0.00%	0.00%
Expected stock price volatility	62.80%	63.40%
Risk-free interest rate	3.00%	3.30%
Expected life of option (years)	8 years	8 years

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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