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Deferred Revenue and Performance Obligation (Notes)
 12 Months Ended
Dec. 31, 2018
Deferred Revenue and Performance Obligation [Abstract]  
Deferred revenue and performance obligation [Text Block]
Deferred Revenue and Performance Obligations

Deferred Revenue

For the year ended December 31, 2018 and 2017, the Company recognized approximately $74.6 million and $65.6 million, respectively, in each case of revenue that was included in the deferred revenue balances at the beginning of the respective periods and primarily related to subscription services, maintenance and support, and other services.

Performance Obligations

As of December 31, 2018, the Company expects to recognize approximately $336.5 million of revenue from remaining performance obligations. The Company expects to recognize revenue on approximately $162.2 million of these performance obligations over the next 12 months, with the balance recognized thereafter.