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Acquisitions - Summary of Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Jun. 22, 2015
Business Acquisition [Line Items]      
Goodwill $ 5,049,321 $ 5,047,885  
Synageva BioPharma Corp.      
Business Acquisition [Line Items]      
Cash     $ 626,217
Inventory     23,880
In-process research and development (IPR&D)     4,236,000
Deferred tax liabilities, net     (171,638)
Other assets and liabilities     (26,373)
Net assets acquired     4,688,086
Goodwill     4,795,248
Total purchase price     $ 9,483,334