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SEGMENT INFORMATION - Revenue and Long-Lived Assets (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue and Long-lived Assets by Geography
Revenue	$ 359,301	$ 389,913	$ 375,061	$ 343,650	$ 321,508	$ 357,358	$ 343,896	$ 303,443	$ 1,467,925	$ 1,326,205	$ 1,132,241
Long-lived assets (excluding goodwill and intangible assets)	108,842				103,361				108,842	103,361
United States
Revenue and Long-lived Assets by Geography
Revenue									1,379,236	1,234,755	$ 1,050,641
Long-lived assets (excluding goodwill and intangible assets)	97,841				95,822				$ 97,841	$ 95,822
United States | Geographic Concentration Risk
Revenue and Long-lived Assets by Geography
Revenue concentration risk percentage (greater than)									95.00%
United States | Revenue Benchmark | Geographic Concentration Risk
Revenue and Long-lived Assets by Geography
Revenue concentration risk percentage (greater than)									10.00%	10.00%	10.00%
All other countries
Revenue and Long-lived Assets by Geography
Revenue									$ 88,689	$ 91,450	$ 81,600
Long-lived assets (excluding goodwill and intangible assets)	$ 11,001				$ 7,539				$ 11,001	$ 7,539

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