Acquisitions (Reconciliation of Upfront Payments To Total Purchase Price) (Details) (Enobia Pharma Corp. [Member], USD $) In Thousands, unless otherwise specified	Feb. 07, 2012
Enobia Pharma Corp. [Member]
Business Acquisition [Line Items]
Base payment per agreement	$ 610,000
Cash acquired	18,141
Working capital adjustment	(4,265)
Upfront payment in accordance with agreement	623,876
Estimated fair value of contingent consideration	(117,000)
Total purchase price	$ 740,876