Deferred Revenue Deferred Revenue (Details) $ in Thousands	Sep. 30, 2016 USD ($)	Dec. 31, 2015 USD ($) Customers
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	$ 157,086	$ 120,037
Long-term deferred revenue	23,467	33,306
Deferred revenue in current liabilities	133,619	86,731
Product [Member]
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	71,182	22,215
Service [Member]
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	85,904	97,822
Government Contracts Concentration Risk [Member]
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	$ 91,900	$ 57,700
Deferred Revenue [Member] | Non-US Government Customers [Member]
Deferred Revenue Arrangement [Line Items]
Number of customers | Customers		0
Concentration risk, percent		10.00%