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Investment in TowerJazz Semiconductor Ltd. (Details) (TowerJazz [Member], USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013
TowerJazz [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of shares held	42,970
Net unrealized gain on available-for-sale securities	$ (54)
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)	$ 7.04

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