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SIGNIFICANT ACCOUNTING POLICIES (Warranty) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
SIGNIFICANT ACCOUNTING POLICIES [Abstract]    
Warranty provision, beginning of year $ 1,978 $ 1,676
Charged to costs and expenses relating to new sales 1,126 1,052
Acquisition of the business of U.S. Quartz    508
Costs of product warranty claims (937) (1,109)
Foreign currency translation adjustments 56 (149)
Warranty provision, end of year $ 223 $ 1,978
Minimum [Member]
    
Warranty:    
Warranty term 3 years  
Maximum [Member]
    
Warranty:    
Warranty term 10 years