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Summary of Intangible Asset Account Activity (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Total Intangible Assets [Abstract]    
Intangible assets, gross beginning balance $ 1,000,037 $ 979,814
Intangibles disposed in sale of business 0 (18,140)
Effect of change in exchange rates (9,082) (9,449)
Intangible assets, gross ending balance 990,955 952,225
Intangible liabilities, gross beginning balance 23,900 23,900
Effect of change in exchange rates 0 0
Intangible liabilities, gross ending balance $ 23,900 $ 23,900