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WARRANTY COSTS AND OTHER CONTINGENCIES - Analysis of warranty accruals (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 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 (774) (374)
Add: Warranty provision for the period 679 829
Changes to warranty provision for prior periods (137) (443)
Balance at March 31 $ 3,173 $ 3,848