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WARRANTY COSTS AND OTHER CONTINGENCIES - Analysis of warranty accruals (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Warranty accrual:    
Balance at beginning of period $ 5,607 $ 5,373
Less: Payments made during the period (3,134) (3,016)
Add: Warranty provision for the period 3,135 3,026
Changes to warranty provision for prior periods 93 56
Balance at end of the period $ 5,701 $ 5,439