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WARRANTY COSTS - Analysis of warranty accruals (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Warranty accruals    
Balance at beginning of year $ 7,078 $ 5,699
Less: Payments made during the period (3,374) (3,316)
Add: Warranty provision for the period 2,909 4,704
Changes to warranty provision for prior periods (11) 156
Balance at end of year $ 6,602 $ 7,243