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WARRANTY COSTS - Analysis of warranty accruals (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Warranty accruals    
Balance at beginning of year $ 7,078 $ 5,699
Less: Payments made during the period (2,453) (2,091)
Add: Warranty provision for the current year 2,162 3,495
Changes to warranty provision for prior periods 41 156
Balance at end of year $ 6,828 $ 7,259