Revenue - Change in Deferred Revenue (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)
Movement in Deferred Revenue [Roll Forward]
Deferred revenue at December 31, 2018	$ 164,925
Deferral of revenue billed in current period, net of recognition	95,934
Recognition of revenue deferred in prior periods	(103,274)
Acquisitions/Divestitures	(7,955)
Foreign currency translation impact	1,451
Deferred revenue as of September 30, 2020	$ 151,081