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WARRANTY COSTS AND OTHER CONTINGENCIES - Analysis of warranty accruals (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021
Warranty accruals: |  |
Balance at beginning of year | $ 4,641 | $ 5,030
Less: Payments made during the year | (3,600) | (2,880)
Add: Warranty provision for the current year | 3,950 | 2,707
Changes to warranty provision for prior years | 145 | 207
Balance at end of year | $ 5,136 | $ 5,064

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