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GENERAL (Schedule of Unaudited Pro Forma Revenues and Earnings of U.S. Quartz Products, Inc.) (Details) (U.S. Quartz Products, Inc. [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
U.S. Quartz Products, Inc. [Member]
   
Business Acquisition [Line Items]    
Revenues $ 271,874 $ 233,206
Net income $ 25,222 $ 23,489
Basic net earnings per share $ 0.91 $ 0.85
Diluted net earnings per share $ 0.91 $ 0.85