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WARRANTY COSTS AND OTHER CONTINGENCIES - Analysis of warranty accruals (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Warranty accruals:    
Balance at beginning of period $ 5,410 $ 5,607
Less: Payments made during the period (1,380) (2,002)
Add: Warranty provision for the period 1,251 2,191
Changes to warranty provision for prior periods 62 93
Balance at June 30 $ 5,343 $ 5,889