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WARRANTY COSTS AND OTHER CONTINGENCIES - Analysis of warranty accruals (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance at beginning of period $ 3,405 $ 3,836
Less: Payments made during the period (2,184) (1,213)
Add: Warranty provision for the period 2,357 1,993
Changes to warranty provision for prior periods 299 (858)
Balance at September 30 $ 3,877 $ 3,758