Hedging Hedging - Cash Flow Hedging Instruments (Details) - Foreign currency forward contracts - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Product revenues, net \| Designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on cash flow hedging instruments	$ (1,252)	$ 768	$ 10,543
Other (expense) income, net \| Not designated as hedging instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on cash flow hedging instruments	$ 623	$ 14,129	$ (6,917)

Amount of unrealized gain (loss) related to derivatives designated as cash flow hedging instruments, recorded in results of operations to the extent that the cash flow hedge is determined to be ineffective.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration