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WARRANTY COSTS AND OTHER CONTINGENCIES - Analysis of warranty accruals (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance at beginning of period $ 5,373 $ 4,629
Less: Payments made during the period (3,016) (2,013)
Add: Warranty provision for the period 3,026 2,561
Changes to warranty provision for prior periods 56 60
Balance at September 30 $ 5,439 $ 5,237