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WARRANTY COSTS AND OTHER CONTINGENCIES - Analysis of warranty accruals (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 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 (608) (774)
Add: Warranty provision for the period 872 679
Changes to warranty provision for prior periods 51 (137)
Balance at March 31 $ 4,944 $ 3,173