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WARRANTY COSTS AND OTHER CONTINGENCIES - Analysis of warranty accruals (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Warranty accruals:    
Balance at beginning of year $ 5,410 $ 5,607
Less: Payments made during the year (767) (950)
Add: Warranty provision for the year 721 1,044
Changes to warranty provision for prior years 50 65
Balance at end of the year $ 5,414 $ 5,766