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SIGNIFICANT ACCOUNTING POLICIES - Analysis of warranty accruals (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance at beginning of year $ 2,522 $ 1,973
Less: Payments made during the year (1,558) (1,696)
Add: Warranty provision for the current year 2,511 2,205
Changes to warranty provision for prior years (65) 40
Balance at end of year $ 3,410 $ 2,522