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Share-Based Compensation (Schedule Of Weighted-Average Key Assumptions Used In Determining Fair Value Of Stock Option) (Details) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Share-Based Compensation [Abstract]
Weighted-average volatility	94.00%	83.00%
Weighted-average risk-free interest rate	1.10%	2.60%
Weighted-average expected term in years	5.7	3.8
Dividend yield	0.00%	0.00%
Weighted-average grant date fair value	$ 1.68	$ 5.94

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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