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Investment in TowerJazz Semiconductor Ltd.	6 Months Ended
	Jul. 01, 2012
Investments, Debt and Equity Securities [Abstract]
Investment in TowerJazz Semiconductor Ltd.	Investment in TowerJazz Semiconductor Ltd. As of July 1, 2012, the Company held 644,543 available-for-sale TowerJazz ordinary shares with a net unrealized gain of $76,000 recorded in accumulated other comprehensive income, or AOCI, on the balance sheet which includes a tax benefit and the difference between the cost of of $0.13 per share and carrying value of $0.67 per share, their fair value on the last trading day of the reporting period. The fair value of TowerJazz marketable securities as of July 1, 2012 was determined based on “Level 1” inputs as described in Note 7. In the first six months of 2012, the Company recorded $63,000 of tax benefit related to AOCI attributable to unrealized gains on investment in TowerJazz.

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The entire disclosure for investments in certain debt and equity securities.

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