Summary of Intangible Asset Account Activity (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Total Intangible Assets [Abstract]
Beginning balance, intangible assets, gross	$ 981,160	$ 769,851
Finite-lived Intangible Assets Acquired	0	241,539
Effect of change in exchange rates	4,349	(18,883)
Ending balance, intangible assets, gross	985,509	992,507
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)