Summary of Intangible Asset Account Activity (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Total Intangible Assets [Abstract]
Beginning balance, intangible assets, gross	$ 769,851	$ 669,896
Finite-lived Intangible Assets Acquired	242,039	36,500
Effect of change in exchange rates	(15,352)	57,640
Ending balance, intangible assets, gross	996,538	764,036
Beginning balance, intangible liabilities, gross	0	0
Customer contract and relationships	(23,900)		$ 0
Effect of change in exchange rates	0	0
Ending balance, intangible liabilities, gross	$ (23,900)	$ 0