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WARRANTY COSTS AND OTHER CONTINGENCIES - Analysis of warranty accruals (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Warranty accrual:    
Balance at beginning of period $ 5,607 $ 5,373
Less: Payments made during the period (2,002) (1,945)
Add: Warranty provision for the period 2,191 2,093
Changes to warranty provision for prior years 93 52
Balance at end of the period $ 5,889 $ 5,573