Segment and Major Customers Information - Revenue by Product (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Revenue	$ 238,460	$ 225,914	$ 693,082	$ 654,066
Product and related subscription and support
Segment Reporting Information [Line Items]
Revenue	108,731	117,835	318,223	353,773
Platform, cloud subscription and managed services
Segment Reporting Information [Line Items]
Revenue	75,105	61,988	217,001	170,055
Professional services
Segment Reporting Information [Line Items]
Revenue	$ 54,624	$ 46,091	$ 157,858	$ 130,238