SEGMENT INFORMATION Schedule of Gross Profit by Segment (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]
Gross Profit	$ 305,989	$ 309,425	$ 954,532	$ 946,943
North America
Segment Reporting Information [Line Items]
Gross Profit	204,048	207,908	643,099	662,705
International
Segment Reporting Information [Line Items]
Gross Profit	101,941	101,517	311,433	284,238
Service | Local | North America
Segment Reporting Information [Line Items]
Gross Profit	159,379	162,914	491,420	511,865
Service | Local | International
Segment Reporting Information [Line Items]
Gross Profit	71,639	67,860	209,214	189,357
Service | Goods | North America
Segment Reporting Information [Line Items]
Gross Profit	3,634	3,205	10,565	7,719
Service | Goods | International
Segment Reporting Information [Line Items]
Gross Profit	2,320	3,639	9,972	11,800
Service | Travel | North America
Segment Reporting Information [Line Items]
Gross Profit	13,801	14,060	46,106	46,980
Service | Travel | International
Segment Reporting Information [Line Items]
Gross Profit	8,649	8,922	28,219	28,954
Product | Goods | North America
Segment Reporting Information [Line Items]
Gross Profit	27,234	27,729	95,008	96,141
Product | Goods | International
Segment Reporting Information [Line Items]
Gross Profit	$ 19,333	$ 21,096	$ 64,028	$ 54,127