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Liabilities - Customer Deposits and Deferred Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Liabilities    
Customer deposits and deferred revenue $ 46,400 $ 46,900
Changes in deferred revenue    
Beginning balance 16,276  
Deferral of revenue 2,386  
Recognition of unearned revenue (3,170)  
Ending balance $ 15,492