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WARRANTY COSTS AND OTHER CONTINGENCIES - Analysis of warranty accruals (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Jun. 30, 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 (618) (824)
Add: Warranty provision for the period 1,438 1,271
Changes to warranty provision for prior periods 108 167
Balance at June 30 $ 4,338 $ 3,136