Investment in TowerJazz Semiconductor Ltd	3 Months Ended
Investment in TowerJazz Semiconductor Ltd	Apr. 01, 2012
Investment in TowerJazz Semiconductor Ltd [Abstract]
Investment in TowerJazz Semiconductor Ltd	Investment in TowerJazz Semiconductor Ltd. As of April 1, 2012, the Company held 644,543 available-for-sale TowerJazz ordinary shares with a net unrealized gain of $211,000 recorded in 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 $0.88 per share, their fair value on the last trading day of the reporting period. The fair value of TowerJazz marketable securities as of April 1, 2012 was determined based on “Level 1” inputs as described in Note 7. In the first quarter of 2012, the Company recorded $63,000 of tax benefit related to accumulated other comprehensive income, or AOCI, attributable to unrealized gains on investment in TowerJazz.

- Definition

Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets.

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