Fair Value Measurements and Derivative Instruments - Non-Derivative Net Investment (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Foreign Currency Debt
Net investment hedge
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss)	$ (2,994)	$ 15,853	$ 2,708	$ 7,609

Amount, before tax and reclassification, of gain (loss) from derivative designated and qualifying as net investment hedge.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4CCC
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998896-113959

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