Stockholders' Equity And Share-Based Awards (Assumptions Used To Determine Weighted Average Grant Date Fair Value) (Details)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility		60.70%	58.30%
Risk-free interest rates		2.30%	2.30%
Expected life (in years)		4.5	4.5
Restricted Shares With Common Stock Price Thresholds [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	44.00%	49.40%	50.40%
Risk-free interest rates	2.20%	2.60%	1.40%
Derived service periods (in years)	0.2	0.1	0.2

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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