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WARRANTY COSTS AND OTHER CONTINGENCIES - Analysis of warranty accruals (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Jun. 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 (1,345) (1,428)
Add: Warranty provision for the period 1,796 1,375
Changes to warranty provision for prior periods 60 1
Balance at June 30 $ 5,140 $ 3,353