Acquisitions (Details Textual) (USD $)					3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2010	Mar. 31, 2012 Stromedix, Inc. [Member]	Mar. 08, 2012 Stromedix, Inc. [Member]	Mar. 07, 2012 Stromedix, Inc. [Member]	Mar. 08, 2012 Stromedix, Inc. [Member] STX-100 [Member]
Acquisitions (Textual) [Abstract]
Cash portion of consideration						$ 75,000,000
Value of contingent consideration						487,500,000		275,000,000
Contingent consideration	(269,900,000)	(151,000,000)	(82,400,000)	(81,200,000)		117,600,000
Discount rate used to calculate fair value of in process research and development						20.00%
In process research and development	219,200,000					219,200,000		202,600,000
In process research and development								290,000,000
Percentage of equity interest to the portion of total capital stock							5.00%
Recognized gain					$ 9,000,000