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WARRANTY COSTS - Analysis of warranty accruals (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Warranty accruals    
Balance at beginning $ 6,228 $ 7,078
Less: Payments made during the period (3,392) (3,374)
Add: Warranty provision for the period 2,755 2,909
Changes to warranty provision for prior periods 471 (11)
Balance at end $ 6,062 $ 6,602