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REVENUE - Geographic Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 313,499	$ 265,591
Percent of total revenue	100.00%	100.00%
U.S.
Disaggregation of Revenue [Line Items]
Revenue	$ 194,568	$ 172,417
Other Americas
Disaggregation of Revenue [Line Items]
Revenue	11,901	15,342
United Kingdom (“U.K.”)
Disaggregation of Revenue [Line Items]
Revenue	28,212	21,837
Europe (excluding U.K.), Middle East, and Africa
Disaggregation of Revenue [Line Items]
Revenue	51,659	31,938
Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	$ 27,159	$ 24,057
Total revenue | U.S.
Disaggregation of Revenue [Line Items]
Percent of total revenue	62.00%	65.00%
Total revenue | Other Americas
Disaggregation of Revenue [Line Items]
Percent of total revenue	4.00%	6.00%
Total revenue | United Kingdom (“U.K.”)
Disaggregation of Revenue [Line Items]
Percent of total revenue	9.00%	8.00%
Total revenue | Europe (excluding U.K.), Middle East, and Africa
Disaggregation of Revenue [Line Items]
Percent of total revenue	16.00%	12.00%
Total revenue | Asia-Pacific
Disaggregation of Revenue [Line Items]
Percent of total revenue	9.00%	9.00%

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