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Segment Information - Revenue by Geographic Area (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 1,437,451 | $ 1,560,983 | $ 2,986,571 | $ 3,271,078
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,606,636 | 1,710,164 | 3,360,767 | 3,593,308
Operating Segments | North America |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 950,169 | 933,217 | 1,853,490 | 1,956,277
Operating Segments | International |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 656,467 | 776,947 | 1,507,277 | 1,637,031
Operating Segments | International | Europe |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 317,143 | 356,300 | 656,792 | 691,085
Operating Segments | International | Latin America |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 198,760 | 216,760 | 411,778 | 420,826
Operating Segments | International | Global Emerging Markets |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 140,564 | 203,887 | 438,707 | 525,120
Segment Reconciling Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ (169,185) | $ (149,181) | $ (374,196) | $ (322,230)

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