SEGMENT AND GEOGRAPHIC INFORMATION - Total Revenue by Major Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Total Revenues	$ 370,232	$ 379,095	$ 983,221	$ 1,122,430
United States
Segment Reporting Information [Line Items]
Total Revenues	266,477	266,280	695,179	796,397
Europe
Segment Reporting Information [Line Items]
Total Revenues	45,995	49,242	123,917	148,753
Asia Pacific
Segment Reporting Information [Line Items]
Total Revenues	40,473	42,079	113,934	114,810
Rest of World
Segment Reporting Information [Line Items]
Total Revenues	$ 17,287	$ 21,494	$ 50,191	$ 62,470