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WARRANTY COSTS - Analysis of warranty accruals (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Warranty accruals    
Balance at beginning $ 6,228 $ 7,078
Less: Payments made during the period (1,110) (965)
Add: Warranty provision for the period 882 1,073
Changes to warranty provision for prior periods 45 28
Balance at end $ 6,045 $ 7,214