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Revenue Recognition - Deferred Revenue Activity (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
Movement in Deferred Revenue [Roll Forward]  
Balance as of December 31, 2017 $ 9,420
Increases to deferred revenue and customer deposits 55,408
Recognition of revenue (50,590)
Foreign exchange rate changes (986)
Balance as of September 30, 2018 $ 13,252