Financial Statements Details - Deferred Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Jan. 01, 2018
Movement in Deferred Revenue [Roll Forward]
Deferred revenue, beginning balance	$ 587,227	$ 498,740
Less: Revenue recognized from beginning balance	(190,597)	(157,684)
Add: Deferral of revenue in current period, excluding amounts recognized during the period	139,841	114,998
Deferred revenue, ending balance	536,471	456,054
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Deferred revenue	$ 587,227	$ 498,740
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Deferred revenue			$ (16,500)