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WARRANTY COSTS AND OTHER CONTINGENCIES - Analysis of warranty accruals (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Warranty accruals:    
Balance at beginning of year $ 4,641 $ 5,030
Less: Payments made during the year (2,286) (2,057)
Add: Warranty provision for the current year 2,328 1,779
Changes to warranty provision for prior years 104 179
Balance at end of year $ 4,787 $ 4,931