Intangible Assets and Goodwill - Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, Gross Carrying Amount	$ 309,180	$ 400,560
Amortizable intangible assets, Accumulated Amortization and Other Charges	(23,215)	(38,959)
Amortizable intangible assets, Net Carrying Amount	285,965	361,601
In-process research & development	0	253,620
Intangible Assets, Gross Carrying Amount	309,180	654,180
Intangible Assets, Net Carrying Amount	285,965	615,221
In-process research & development
Acquired Finite-Lived Intangible Assets [Line Items]
In-process research & development	0	253,620
Product licenses
Acquired Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, Gross Carrying Amount	0	30,000
Amortizable intangible assets, Accumulated Amortization and Other Charges	0	(3,013)
Amortizable intangible assets, Net Carrying Amount	0	26,987
Developed product rights
Acquired Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, Gross Carrying Amount	309,180	370,560
Amortizable intangible assets, Accumulated Amortization and Other Charges	(23,215)	(35,946)
Amortizable intangible assets, Net Carrying Amount	$ 285,965	$ 334,614