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GENERAL (Schedule of Revenues and Earnings of U.S. Quartz Products, Inc.) (Details) (U.S. Quartz Products, Inc. [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
U.S. Quartz Products, Inc. [Member]
 
Business Acquisition [Line Items]  
Revenues $ 46,843
Net income $ (511)