Share-Based Compensation (Schedule Of Weighted-Average Key Assumptions Used In Determining Fair Value Of Stock Option Awards) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Weighted-average volatility	108.00%		86.00%
Weighted-average risk-free interest rate	1.10%		2.40%
Weighted-average expected term in years	3.1		3.1
Dividend yield	0.00%		0.00%
Weighted-average grant date fair value	$ 5.01		$ 5.21
Stock Options [Member]
Weighted-average volatility	100.00%	77.00%	92.00%	78.00%
Weighted-average risk-free interest rate	2.50%	2.80%	2.50%	2.90%
Weighted-average expected term in years	3.7	7.2	3.7	6.9
Dividend yield	0.00%	0.00%	0.00%	0.00%
Weighted-average grant date fair value	$ 6.57	$ 8.28	$ 6.27	$ 8.87