Summary of Intangible Asset Account Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Total Intangible Assets [Abstract]
Beginning balance, intangible assets, gross	$ 981,160	$ 769,851
Finite-lived Intangible Assets Acquired	0	240,600
Effect of change in exchange rates	2,359	22,979
Ending balance, intangible assets, gross	983,519	1,033,430
Beginning balance, intangible liabilities, gross	(23,900)	0
Customer contract and relationships	0		$ (23,900)
Effect of change in exchange rates	0	0
Ending balance, intangible liabilities, gross	$ (23,900)	$ (23,900)