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Deferred revenue
 12 Months Ended
Dec. 31, 2023
Subclassifications of assets, liabilities and equities [abstract]  
Deferred revenue Deferred revenue:
Deferred revenue (i.e. contract liabilities) represents cash received from customers in excess of revenue recognized on uncompleted contracts.
Deferred revenueDecember 31, 2023December 31, 2022
Beginning Balance$8,030 $12,109 
Additions to deferred revenue21,790 21,650 
Revenue recognized during the year(25,232)(25,729)
Ending Balance$4,588 $8,030