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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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