XML 28 R52.htm IDEA: XBRL DOCUMENT

SHARE-BASED COMPENSATION AND EMPLOYEE BENEFIT PLANS (Options, Valuation Assumptions) (Details) (Stock Options [Member])	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Valuation Assumptions [Line Items]
Dividend yield	0.00%
Average expected life in years	5 years	5 years
Minimum [Member]
Valuation Assumptions [Line Items]
Risk-free interest rate	0.37%	1.00%
Expected volatility	56.80%	58.60%
Maximum [Member]
Valuation Assumptions [Line Items]
Risk-free interest rate	1.60%	3.00%
Expected volatility	77.90%	75.40%

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.

+ References+ Details