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WARRANTY COSTS AND OTHER CONTINGENCIES - Analysis of warranty accruals (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Warranty accruals:    
Balance at beginning of year $ 5,699 $ 4,641
Less: Payments made during the period (2,091) (2,286)
Add: Warranty provision for the period 3,495 2,328
Changes to warranty provision for prior periods 156 104
Balance at end of year $ 7,259 $ 4,787