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Goodwill and Other Intangible Assets - Aggregate Amortization Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]    
Cost of subscriptions and licenses $ 1,151 $ 1,013
Amortization of purchased intangibles 3,438 3,436
Total amortization expense $ 4,589 $ 4,449