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EQUITY Share-based compensation option-pricing model assumptions (Details)	3 Months Ended
	Mar. 31, 2013
Equity [Abstract]
Risk-free interest rate	1.30%
Expected term of options, in years	6 years 8 months
Expected annual volatility	57.00%
Expected dividend yield	2.00%

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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