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Stock-Based Compensation and Stock Options - Stock Option Valuation Weighted Average Assumptions (Details) (Stock Options, USD $)	12 Months Ended
	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected life in years	6 years 3 months
Employee Options 2009
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Weighted-average fair value of options granted per share	11.56
Historical volatility	93.00%
Risk-free interest rate	2.56%
Dividend yield	0.00%
Expected life in years	6 years 3 months
Employee Options 2012
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Weighted-average fair value of options granted per share	19.08
Historical volatility	74.00%
Risk-free interest rate	1.11%
Dividend yield	0.00%
Expected life in years	6 years 3 months

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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