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WARRANTY COSTS AND OTHER CONTINGENCIES - Analysis of warranty accruals (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance at beginning of period $ 3,836 $ 3,410
Less: Payments made during the period (1,213) (1,039)
Add: Warranty provision for the period 1,993 1,918
Changes to warranty provision for prior periods (858) (66)
Balance at September 30 $ 3,758 $ 4,223