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SIGNIFICANT ACCOUNTING POLICIES - Analysis of warranty accruals (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance at beginning of year $ 3,410us-gaap_ProductWarrantyAccrual $ 2,522us-gaap_ProductWarrantyAccrual
Less: Payments made during the year (1,551)us-gaap_ProductWarrantyAccrualPayments (1,558)us-gaap_ProductWarrantyAccrualPayments
Add: Warranty provision for the current year 1,863us-gaap_ProductWarrantyAccrualWarrantiesIssued 2,511us-gaap_ProductWarrantyAccrualWarrantiesIssued
Changes to warranty provision for prior years 114us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease (65)us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease
Balance at end of year $ 3,836us-gaap_ProductWarrantyAccrual $ 3,410us-gaap_ProductWarrantyAccrual