COMMON STOCK Restricted Stock - Market Based Awards Fair Value Assumptions (Details) (Restricted Stock - Market Based Awards [Member], USD $)	12 Months Ended
Dec. 31, 2012 Rate	Dec. 31, 2011 Rate	Dec. 31, 2010
Restricted Stock - Market Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term of award	3 years	3 years
Risk-free interest rate	0.30%	1.10%
Expected Volatility	65.30%	74.20%
Weighted-average grant date fair value per share	$ 36.54	$ 58.53	$ 0

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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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