THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 555,450	$ 497,973	$ 1,100,092	$ 962,598
Direct Revenue
Disaggregation of Revenue [Line Items]
Revenue	546,741	487,300	1,081,565	941,262
Indirect Revenue (principally advertising revenue)
Disaggregation of Revenue [Line Items]
Revenue	8,709	10,673	18,527	21,336
North America | Direct Revenue
Disaggregation of Revenue [Line Items]
Revenue	284,318	251,499	547,665	489,272
International | Direct Revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 262,423	$ 235,801	$ 533,900	$ 451,990