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WARRANTY COSTS AND OTHER CONTINGENCIES - Analysis of warranty accruals (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance at beginning of period $ 3,410 $ 2,522
Less: Payments made during the period (309) (496)
Add: Warranty provision for the period 731 662
Changes to warranty provision for prior periods 70 87
Balance at March 31 $ 3,902 $ 2,775