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WARRANTY COSTS AND OTHER CONTINGENCIES - Analysis of warranty accruals (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance at beginning of period $ 5,607 $ 5,373
Less: Payments made during the period (950) (689)
Add: Warranty provision for the period 1,044 981
Changes to warranty provision for prior periods 65 38
Balance at March 31 $ 5,766 $ 5,703