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WARRANTY COSTS - Analysis of warranty accruals (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Warranty accruals:    
Balance at beginning of year $ 5,699 $ 4,641
Less: Payments made during the period (3,316) (3,600)
Add: Warranty provision for the period 4,704 3,950
Changes to warranty provision for prior periods 156 145
Balance at end of year $ 7,243 $ 5,136