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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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