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WARRANTY COSTS AND OTHER CONTINGENCIES - Analysis of warranty accruals (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance at beginning of period $ 2,522 $ 1,973
Less: Payments made during the period (1,232) (1,286)
Add: Warranty provision for the period 1,903 1,698
Changes to warranty provision for prior periods 222 92
Balance at September 30 $ 3,415 $ 2,477