Summary of Significant Accounting Policies - Schedule of Revenue Disaggregated by Revenue Type, Geographic Region and Customer (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue:
Total revenue	$ 1,169,258	$ 1,089,752	$ 1,046,487
Percentage of total revenue	100.00%	100.00%	100.00%
Broadband/Cable/Satellite
Revenue:
Percentage of total revenue	52.00%	54.00%	57.00%
Telecommunications
Revenue:
Percentage of total revenue	20.00%	20.00%	19.00%
Other
Revenue:
Percentage of total revenue	28.00%	26.00%	24.00%
Americas (principally the U.S.)
Revenue:
Percentage of total revenue	86.00%	85.00%	85.00%
Europe, Middle East and Africa
Revenue:
Percentage of total revenue	10.00%	11.00%	11.00%
Asia Pacific
Revenue:
Percentage of total revenue	4.00%	4.00%	4.00%
SaaS and Related Solutions
Revenue:
Total revenue	$ 1,024,572	$ 956,995	$ 926,290
Software and Services
Revenue:
Total revenue	98,078	87,247	72,818
Maintenance
Revenue:
Total revenue	$ 46,608	$ 45,510	$ 47,379