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Segment Information - Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Revenues	$ 840,748	$ 974,477	$ 1,549,120	$ 1,710,095
Operating Segments
Segment Reporting Information [Line Items]
Revenues	954,120	1,068,506	1,754,131	1,883,144
Operating Segments | North America
Segment Reporting Information [Line Items]
Revenues	487,444	574,758	903,321	1,023,060
Operating Segments | International
Segment Reporting Information [Line Items]
Revenues	466,676	493,748	850,810	860,084
Operating Segments | International | Europe
Segment Reporting Information [Line Items]
Revenues	171,311	178,224	339,649	334,785
Operating Segments | International | Latin America
Segment Reporting Information [Line Items]
Revenues	138,550	134,297	213,018	204,065
Operating Segments | International | Global Emerging Markets
Segment Reporting Information [Line Items]
Revenues	156,815	181,227	298,143	321,234
Segment Reconciling Items
Segment Reporting Information [Line Items]
Revenues	$ (113,372)	$ (94,029)	$ (205,011)	$ (173,049)

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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