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GENERAL (Acquisition of Shares of U.S. Quartz Products, Inc.) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 0 Months Ended | 12 Months Ended |
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | May 18, 2011 U.S. Quartz Products, Inc. [Member] | Dec. 31, 2012 U.S. Quartz Products, Inc. [Member] | Jan. 29, 2007 U.S. Quartz Products, Inc. [Member]
Business Acquisition [Line Items] |  |  |  |  |  |
Aggregate purchase price |  |  |  |  |  | $ 9,900
Equity method investment, ownership percentage |  |  |  |  |  | 25.00%
Ownership percentage of acquiree prior to acquisition |  |  |  | 25.00% |  |
Percentage of equity interest acquired |  |  |  | 75.00% |  |
Total consideration |  |  |  | 26,500 |  |
Consideration paid at closing |  |  |  | 20,000 |  |
Additional consideration if IPO occurs by May 31, 2012 |  |  |  | 6,500 |  |
Additional consideration if IPO does not occur by May 31, 2012 |  |  |  | 5,000 |  |
General and administrative expenses costs related to the acquisition |  |  |  | 145 |  |
Repayment of loans to former shareholders | 6,242 |  |  |  | 5,541 |
Investment in affiliate |  |  |  | 5,481 |  |
Fair value of the company's equity interest held before the business combination |  |  |  | 6,807 |  |
Reclassification of previously recorded amounts in other comprehensive income (foreign currency translation adjustments) |  |  |  | 1,352 |  |
Equity in losses of affiliate, net, as a result of remeasurement |  |  |  | $ 26 |  |

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