SEGMENT INFORMATION Schedule of Gross Profit by Segment (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]
Gross Profit	$ 323,658	$ 328,067	$ 648,543	$ 637,518
North America
Segment Reporting Information [Line Items]
Gross Profit	219,371	233,860	439,051	454,797
International
Segment Reporting Information [Line Items]
Gross Profit	104,287	94,207	209,492	182,721
Service | Local | North America
Segment Reporting Information [Line Items]
Gross Profit	165,285	179,609	332,041	348,951
Service | Local | International
Segment Reporting Information [Line Items]
Gross Profit	67,360	62,303	137,575	121,497
Service | Goods | North America
Segment Reporting Information [Line Items]
Gross Profit	2,990	3,207	6,931	4,514
Service | Goods | International
Segment Reporting Information [Line Items]
Gross Profit	4,565	4,506	7,652	8,161
Service | Travel | North America
Segment Reporting Information [Line Items]
Gross Profit	16,303	17,755	32,305	32,920
Service | Travel | International
Segment Reporting Information [Line Items]
Gross Profit	8,919	9,996	19,570	20,032
Product | Goods | North America
Segment Reporting Information [Line Items]
Gross Profit	34,793	33,289	67,774	68,412
Product | Goods | International
Segment Reporting Information [Line Items]
Gross Profit	$ 23,443	$ 17,402	$ 44,695	$ 33,031