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Liabilities - Customer Deposits and Deferred Revenue (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Liabilities    
Customer deposits and deferred revenue $ 34,600 $ 28,300
Changes in deferred revenue    
Beginning balance 44,415  
Deferral of revenue 12,012  
Recognition of previously deferred revenue (6,977)  
Ending balance $ 49,450