Revenue - Change in Deferred Revenue (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Change in Contract with Customer, Liability [Roll Forward]
Deferred revenue	$ 159,924
Deferral of revenue billed in current period, net of recognition	116,842
Recognition of revenue deferred in prior periods	(111,417)
Foreign currency translation impact	(424)
Deferred revenue	$ 164,925