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Revenue from Contracts with Customer - Schedule of Revenue Disaggregation by Type (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
Disaggregation of Revenue [Line Items]
Total revenues	$ 219,567	$ 202,997	$ 184,290	$ 194,690	$ 202,922	$ 186,588	$ 169,605	$ 177,539	$ 801,544	$ 736,654	$ 691,710
Revenues										734,849	691,710
Subscriptions and licenses
Disaggregation of Revenue [Line Items]
Total revenues									736,655	667,993	618,486
Revenues										666,444	618,486
Subscriptions
Disaggregation of Revenue [Line Items]
Total revenues									679,273	608,300	557,421
Revenues										613,925	557,421
SELECT subscriptions
Disaggregation of Revenue [Line Items]
Total revenues									270,749	267,249
Revenues										267,340	273,745
Enterprise subscriptions
Disaggregation of Revenue [Line Items]
Total revenues									221,524	184,833
Revenues										196,081	182,816
Term license subscriptions
Disaggregation of Revenue [Line Items]
Total revenues									187,000	156,218
Revenues										150,504	100,860
Perpetual licenses
Disaggregation of Revenue [Line Items]
Total revenues									57,382	59,693	61,065
Revenues										52,519	61,065
Services
Disaggregation of Revenue [Line Items]
Total revenues									64,889	68,661	73,224
Revenues										68,405	73,224
Professional services (recurring)
Disaggregation of Revenue [Line Items]
Total revenues									17,389	22,797
Revenues										22,974	25,981
Professional services (other)
Disaggregation of Revenue [Line Items]
Total revenues									$ 47,500	45,864
Revenues										$ 45,431	$ 47,243