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SEGMENT INFORMATION - Schedule of Gross Profit by Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Segment Reporting Information [Line Items] |  |  |  |
Gross profit | $ 160,022 | $ 277,940 | $ 498,495 | $ 876,088
North America |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross profit | 109,717 | 192,075 | 355,180 | 600,461
International |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross profit | 50,305 | 85,865 | 143,315 | 275,627
Service | North America |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross profit | 98,821 | 168,029 | 307,581 | 520,416
Service | International |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross profit | 39,247 | 71,104 | 106,735 | 224,925
Service | Local | North America |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross profit | 87,507 | 155,032 | 283,004 | 473,787
Service | Local | International |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross profit | 33,687 | 61,183 | 93,054 | 195,941
Service | Goods | North America |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross profit | 7,440 | 2,280 | 14,851 | 7,838
Service | Goods | International |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross profit | 2,849 | 2,589 | 7,422 | 6,241
Service | Travel | North America |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross profit | 3,874 | 10,717 | 9,726 | 38,791
Service | Travel | International |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross profit | 2,711 | 7,332 | 6,259 | 22,743
Product | Goods | North America |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross profit | 10,896 | 24,046 | 47,599 | 80,045
Product | Goods | International |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross profit | $ 11,058 | $ 14,761 | $ 36,580 | $ 50,702

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