STOCK-BASED COMPENSATION Fair Value Assumptions (Details) (TSR Units, USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended
Dec. 31, 2010	Dec. 31, 2011
TSR Units
Share-based Compensation Arrangement by Share-based Payment Award
Historical volatility rate period		3 years
Assumptions used in fair value valuation
Risk Free Interest Rate:	0.72%	1.18%
Expected Stock Price Volatility:	50.40%	49.20%
Expected Service Period:	3 years	2 years 8 months
Expected Dividend Yield (assuming full reinvestment):	0.00%	0.00%
Stock-based compensation expense	$ 0.3	$ 4.6

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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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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