SEGMENT AND GEOGRAPHIC INFORMATION - Total Revenue by Major Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Total Revenues	$ 258,665	$ 383,645	$ 612,989	$ 743,335
United States
Segment Reporting Information [Line Items]
Total Revenues	181,850	273,390	428,702	530,116
Europe
Segment Reporting Information [Line Items]
Total Revenues	32,026	50,871	77,922	99,511
Asia Pacific
Segment Reporting Information [Line Items]
Total Revenues	33,501	37,031	73,461	72,731
Rest of World
Segment Reporting Information [Line Items]
Total Revenues	$ 11,288	$ 22,353	$ 32,904	$ 40,977