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Revenue (Details 1)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
Movement in Deferred Revenue [Roll Forward]  
Balance, beginning of period $ 190,200 [1]
Deferrals in period 31,291 [1]
Recognition of deferrals in period (39,609) [1]
Balance, end of period 181,882 [1]
Movement in Deferred Costs [Roll Forward]  
Balance, beginning of period 63,554 [2]
Deferrals in period 7,840 [2]
Recognition of deferrals in period (9,639) [2]
Balance, end of period $ 61,755 [2]
[1] Deferred revenue is comprised of both Deferred revenue and Noncurrent deferred revenue per the Condensed Consolidated Balance Sheets.
[2] Deferred costs are comprised of both Deferred costs and Noncurrent deferred costs per the Condensed Consolidated Balance Sheets.