Share-Based Compensation (Schedule Of Stock-Based Compensation By Expense Category) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]
Total non-cash compensation expense related to share-based compensation included in operating expense	$ 1,218	$ 1,668
2012 Incentive Plan [Member]
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]
Total non-cash compensation expense related to share-based compensation included in operating expense	877	1,611
2012 Incentive Plan [Member] | Research And Development [Member]
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]
Total non-cash compensation expense related to share-based compensation included in operating expense	157	323
2012 Incentive Plan [Member] | Selling, General And Administrative [Member]
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]
Total non-cash compensation expense related to share-based compensation included in operating expense	$ 720	$ 1,288