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WARRANTY COSTS AND OTHER CONTINGENCIES - Analysis of warranty accruals (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Jun. 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 (695) (618)
Add: Warranty provision for the period 1,596 1,438
Changes to warranty provision for prior periods (677) 108
Balance at June 30 $ 4,060 $ 4,338