Summary Of Significant Accounting Policies (Schedule Of Estimated Stock-Based Compensation) (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Summary Of Significant Accounting Policies [Line Items]
Stock-based compensation	$ 7,410	$ 7,030	$ 23,277	$ 27,234
Selling, General And Administrative Expenses [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock-based compensation	4,983	4,606	15,762	18,027
Research And Development Expenses [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock-based compensation	$ 2,427	$ 2,424	$ 7,515	$ 9,207