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REVENUE - Revenue by Geographic Areas (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 1,017,517	$ 911,383	$ 891,581
Concentration risk percentage	100.00%	100.00%	100.00%
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 613,844	$ 525,191	$ 469,987
Other Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	49,441	60,536	53,239
U.K.
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	91,517	87,382	95,628
Other EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	156,056	137,946	147,248
Asia-Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 106,659	$ 100,328	$ 125,479
Sales Revenue, Net | U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk percentage	61.00%	57.00%	52.00%
Sales Revenue, Net | Other Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk percentage	5.00%	7.00%	6.00%
Sales Revenue, Net | U.K.
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk percentage	9.00%	10.00%	11.00%
Sales Revenue, Net | Other EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk percentage	15.00%	15.00%	17.00%
Sales Revenue, Net | Asia-Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk percentage	10.00%	11.00%	14.00%

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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