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TRANSACTIONS WITH RELATED PARTIES (Schedule of Transactions with Related Parties) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
TRANSACTIONS WITH RELATED PARTIES [Abstract] |  |  |
Revenues (to affiliated company-U.S. Quartz |  | $ 12,833 | $ 30,916
Cost of revenues | 6,147 | 14,720 | 26,967
Research and development | 301 | 347 | 294
Selling and marketing | 682 | 806 | 675
General and administrative | 3,053 | 6,169 | 6,715
Financial and other income, net | $ 236 | $ 29 | $ 73

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