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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)

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- Definition

This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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