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SEGMENT INFORMATION - Schedule of Gross Profit by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Gross Profit	$ 677,294	$ 1,186,129	$ 1,320,601
North America
Segment Reporting Information [Line Items]
Gross Profit	475,631	807,745	890,684
International
Segment Reporting Information [Line Items]
Gross Profit	201,663	378,384	429,917
Service | North America
Segment Reporting Information [Line Items]
Gross Profit	420,799	702,403	744,599
Service | International
Segment Reporting Information [Line Items]
Gross Profit	143,558	309,492	340,811
Service | Local | North America
Segment Reporting Information [Line Items]
Gross Profit	379,040	643,499	671,352
Service | Local | International
Segment Reporting Information [Line Items]
Gross Profit	125,912	269,666	289,427
Service | Goods | North America
Segment Reporting Information [Line Items]
Gross Profit	28,852	13,165	15,302
Service | Goods | International
Segment Reporting Information [Line Items]
Gross Profit	7,150	31,317	38,132
Service | Travel | North America
Segment Reporting Information [Line Items]
Gross Profit	12,907	45,739	57,945
Service | Travel | International
Segment Reporting Information [Line Items]
Gross Profit	10,496	8,509	13,252
Product | Goods | North America
Segment Reporting Information [Line Items]
Gross Profit	54,832	105,342	146,085
Product | Goods | International
Segment Reporting Information [Line Items]
Gross Profit	$ 58,105	$ 68,892	$ 89,106

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