Summary Of Significant Accounting Policies (Schedule Of Estimated Stock-Based Compensation) (Details) (USD $) Share data in Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012 Y	Mar. 31, 2011
Summary Of Significant Accounting Policies [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	0.6
Stock-based compensation	$ 9,158,000	$ 7,917,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	52,200,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	2.6
Selling, general and Administrative Expense [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock-based compensation	6,302,000	5,539,000
Research and Development Expense [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock-based compensation	$ 2,856,000	$ 2,378,000