SEGMENT AND GEOGRAPHIC INFORMATION - Total Revenue by Major Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Total Revenues	$ 360,071	$ 354,324
United States
Segment Reporting Information [Line Items]
Total Revenues	247,793	246,852
Europe
Segment Reporting Information [Line Items]
Total Revenues	45,819	45,896
Asia Pacific
Segment Reporting Information [Line Items]
Total Revenues	47,295	39,960
Rest of World
Segment Reporting Information [Line Items]
Total Revenues	$ 19,164	$ 21,616