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WARRANTY COSTS AND OTHER CONTINGENCIES - Analysis of warranty accruals (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Warranty accruals:    
Balance at beginning of period $ 5,030 $ 5,410
Less: Payments made during the year (2,057) (1,380)
Add: Warranty provision for the current year 1,779 1,251
Changes to warranty provision for prior years 179 62
Balance at June 30 $ 4,931 $ 5,343