Equity Transactions And Stock-Based Compensation Plans Share-based Compensation Assumptions (Details) (Stock Option [Member], USD $)	3 Months Ended
Mar. 31, 2012 Years	Mar. 31, 2011 Years
Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	70.00%	65.00%
Risk-free interest rates	0.80%	1.50%
Expected life in years	5.31	4.33
Options granted	475,156	597,298
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 5.21	$ 4.67

The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

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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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