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Investment in TowerJazz Semiconductor Ltd. (Narrative) (Details) (TowerJazz [Member], USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	3 Months Ended
	Aug. 03, 2012	Sep. 30, 2012
TowerJazz [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of shares held		42,970
Net unrealized gain on available-for-sale securities		$ 24
Available-for-sale securities, cost per share (in dollars per share)		$ 1.95
Available-for-sale securities, carrying value per share (in dollars per share)		$ 8.84
Reverse stock split ratio	15
Tax beneift related to accumulated other comprehensive income		$ 63

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