Goodwill and Intangible Assets - Schedule of Goodwill (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 452,728
Goodwill acquired	34,314
Purchase price allocation adjustments from prior periods	64
Impact of foreign currency exchange rates	(2,165)
Ending balance	$ 484,941