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MARKETABLE SECURITIES (Details 3) (USD $) In Thousands, except Share data in Millions, unless otherwise specified	12 Months Ended			1 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Jun. 30, 2007 ARO	Dec. 31, 2009 ARO
Investment in ARO
Consideration received as a part of sale of HSE (in shares)				5.5
Shares sold					5.5
Pre tax Loss on sale of shares	$ 41	$ 19	$ 12,414		$ 12,300
Remaining shares held prior to recording other-than-temporary impairment charges					1.1
Impairment of long-term investments		$ 7,844	$ 4,936		$ 4,600

The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis.

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