Restatement Of March 2011 Unaudited Quarterly Financial Information (Restatement Of 2011 First Quarter Income Statement Information To Reflect The Final Measurement Of The Fair Value Of The Assets Acquired) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net loss	$ (6,844)	$ (13,679)	$ (11,356)	$ (20,861)
Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net loss		(13,715)		(23,613)
Adjustments [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net loss		$ 36		$ 2,752