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Revenue - Summary of Changes in Deferred Revenue (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2019
USD ($)
Change in Contract with Customer, Liability [Roll Forward]  
Deferred revenue, beginning balance $ 156,135
Deferral of revenue 121,310
Recognition of deferred revenue (139,070)
Foreign currency translation (1,154)
Deferred revenue, ending balance $ 137,221