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Revenue from Contracts with Customers - Disaggregation of Revenues (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]        
Total revenues $ 581,977 $ 533,732 $ 736,654 $ 691,710
Subscriptions        
Disaggregation of Revenue [Line Items]        
Total revenues 501,011 445,338 608,300 557,421
Select Subscription Revenues [Member]        
Disaggregation of Revenue [Line Items]        
Total revenues     267,249 273,745
Enterprise license subscriptions        
Disaggregation of Revenue [Line Items]        
Total revenues 165,268 135,959 184,833 182,816
Term license subscriptions        
Disaggregation of Revenue [Line Items]        
Total revenues 135,895 112,815 156,218 100,860
Licenses        
Disaggregation of Revenue [Line Items]        
Total revenues 245,639 225,921 311,689  
Services        
Disaggregation of Revenue [Line Items]        
Total revenues 44,946 50,139 68,661 73,224
Professional services (recurring)        
Disaggregation of Revenue [Line Items]        
Total revenues 11,624 15,682 22,797 25,981
Professional services (other)        
Disaggregation of Revenue [Line Items]        
Total revenues $ 33,322 $ 34,457 $ 45,864 $ 47,243
Revenue from Rights Concentration Risk [Member] | Revenue Benchmark        
Disaggregation of Revenue [Line Items]        
Concentration risk percentage     8.00%  
Calculated under Revenue Guidance in Effect before Topic 606 [Member]        
Disaggregation of Revenue [Line Items]        
Total revenues     $ 734,849  
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Subscriptions        
Disaggregation of Revenue [Line Items]        
Total revenues     613,925  
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Select Subscription Revenues [Member]        
Disaggregation of Revenue [Line Items]        
Total revenues     267,340  
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Enterprise license subscriptions        
Disaggregation of Revenue [Line Items]        
Total revenues     196,081  
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Term license subscriptions        
Disaggregation of Revenue [Line Items]        
Total revenues     150,504  
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Services        
Disaggregation of Revenue [Line Items]        
Total revenues     68,405  
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Professional services (recurring)        
Disaggregation of Revenue [Line Items]        
Total revenues     22,974  
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Professional services (other)        
Disaggregation of Revenue [Line Items]        
Total revenues     $ 45,431