REVENUE - Revenue by Geographic Areas (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 1,211,653	$ 1,017,517	$ 911,383
Concentration risk percentage	100.00%	100.00%	100.00%
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 690,133	$ 613,844	$ 525,191
Other Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	61,339	49,441	60,536
United Kingdom (“U.K.”)
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	117,580	91,517	87,382
Europe (excluding U.K.), Middle East, and Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	198,080	156,056	137,946
Asia-Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 144,521	$ 106,659	$ 100,328
Sales Revenue, Net | U.S. | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk percentage	57.00%	61.00%	57.00%
Sales Revenue, Net | Other Americas | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk percentage	5.00%	5.00%	7.00%
Sales Revenue, Net | United Kingdom (“U.K.”) | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk percentage	10.00%	9.00%	10.00%
Sales Revenue, Net | Europe (excluding U.K.), Middle East, and Africa | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk percentage	16.00%	15.00%	15.00%
Sales Revenue, Net | Asia-Pacific | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk percentage	12.00%	10.00%	11.00%