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Cash Cash Equivalents and Investments (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jul. 02, 2011	Jun. 30, 2012	Jul. 02, 2011
Summary of realized gains from sale of marketable equity securities
Gains on sale of marketable equity securities		$ 7,987	$ 117	$ 8,052
Losses on sale of marketable equity securities	(2)	(8)	(2)	(8)
Total net gains (losses) on sale of marketable equity securities	(2)	7,979	115	8,044
Amortization of premium or discount related marketable debt investments
Amortization of premium (discount)	$ 20		$ 20

This item represents the net amount of amortization of purchase discounts and premiums related to investments in debt securities. The purchase discount or premium is amortized to income or expense, respectively, over the life (holding period) of the securities to arrive at an amount of periodic interest income or expense which results in a constant effective yield on the investments.

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