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Liabilities - Customer Deposits and Deferred Revenue (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Liabilities    
Customer deposits and deferred revenue $ 39,900 $ 26,600
Changes in deferred revenue    
Beginning balance 28,249  
Deferral of revenue 6,180  
Recognition of previously deferred revenue (16,054)  
Ending balance $ 18,375