INFORMATION ABOUT REVENUE AND GEOGRAPHIC AREAS (Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	$ 249,901	$ 235,942
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	246,527	232,712
All other countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	3,374	3,230
Advertising
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	240,093	227,033
Transactions
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	2,639	3,307
Other services
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	$ 7,169	$ 5,602