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WARRANTY COSTS AND OTHER CONTINGENCIES - Analysis of warranty accruals (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance at beginning of period $ 4,629 $ 3,405
Less: Payments made during the period (2,013) (2,184)
Add: Warranty provision for the period 2,561 2,357
Changes to warranty provision for prior periods 60 299
Balance at September 30 $ 5,237 $ 3,877