Summary Of Significant Accounting Policies (Schedule Of Antidilutive Instruments Excluded From Calculation Of Basic And Diluted Earnings Per Share) (Details) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Summary Of Significant Accounting Policies [Line Items]
Shares excluded from calculating basic and diluted net loss per common share excluded	13,052	10,816	12,065	13,284
Antidilutive Options And Awards To Purchase Common Stock [Member]
Summary Of Significant Accounting Policies [Line Items]
Shares excluded from calculating basic and diluted net loss per common share excluded	3,636	441	2,649	491
Antidilutive Shares Underlying Convertible Senior Notes [Member]
Summary Of Significant Accounting Policies [Line Items]
Shares excluded from calculating basic and diluted net loss per common share excluded	9,416	10,375	9,416	12,793