Summary of Intangible Asset Account Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Total Intangible Assets [Abstract]
Intangible assets, gross beginning balance	$ 1,000,037	$ 979,814
Effect of change in exchange rates	(16,404)	(16,075)
Intangible assets, gross ending balance	983,633	963,739
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