Share-Based Compensation (Schedule Of Stock-Based Compensation By Expense Category) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]
Stock compensation expense	$ 4,583	$ 3,410	$ 4,065
2004 Incentive Plan [Member]
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]
Stock compensation expense	7,105	7,444	6,644
2004 Incentive Plan [Member] | Research And Development [Member]
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]
Stock compensation expense	1,418	3,167	3,188
2004 Incentive Plan [Member] | Selling, General And Administrative [Member]
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]
Stock compensation expense	$ 5,687	$ 4,277	$ 3,456