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Liabilities - Customer Deposits and Deferred Revenue (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Liabilities    
Customer deposits $ 25,200 $ 41,500
Movement in Deferred Revenue    
Beginning balance 70,536  
Deferral of revenue 9,608  
Recognition of previously deferred revenue (31,867)  
Ending balance $ 48,277