Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement [Line Items]
Total revenue	$ 1,681,297	$ 1,515,892	$ 1,293,636
Lease license
Statement [Line Items]
Total revenue	500,105	406,043	275,619
Perpetual license
Statement [Line Items]
Total revenue	280,745	293,587	301,098
Software licenses
Statement [Line Items]
Total revenue	780,850	699,630	576,717
Maintenance
Statement [Line Items]
Total revenue	840,597	760,574	676,883
Service
Statement [Line Items]
Total revenue	59,850	55,688	40,036
Maintenance and service
Statement [Line Items]
Total revenue	$ 900,447	$ 816,262	$ 716,919
Direct revenue, as a percentage of total revenue
Statement [Line Items]
Concentration risk, percentage	77.80%	77.10%	77.60%
Indirect revenue, as a percentage of total revenue
Statement [Line Items]
Concentration risk, percentage	22.20%	22.90%	22.40%