INFORMATION ABOUT REVENUE AND GEOGRAPHIC AREAS (Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	$ 169,030	$ 246,955	$ 418,931	$ 482,897
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	167,270	243,638	413,797	476,349
All other countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	1,760	3,317	5,134	6,548
Advertising
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	162,233	237,842	402,326	464,875
Transactions
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	3,968	3,147	6,607	6,454
Other services
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	$ 2,829	$ 5,966	$ 9,998	$ 11,568