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GENERAL (Schedule of Canadian Quartz Holdings Inc.) (Details) (Canadian Quartz Holdings Inc. [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
May 01, 2011
Business Acquisition [Line Items]    
Goodwill   $ 425
Total assets acquired   5,331
Non-Competition Agreement [Member]
   
Business Acquisition [Line Items]    
Intangible assets   917
Expected useful life 2 years 2 months 16 days  
Customer Relationships [Member]
   
Business Acquisition [Line Items]    
Intangible assets   $ 3,989
Expected useful life 5 years 2 months 16 days