Cash Equivalents and Investments (Details 1) (Fair Value, Measurements, Nonrecurring [Member], USD $) In Thousands	3 Months Ended	9 Months Ended
Oct. 03, 2010	Oct. 03, 2010
Non-marketable equity securities measured and recorded at fair value on a non-recurring basis
Non marketable equity securities fair value disclosure	$ 0	$ 0
Losses in non-marketable equity securities	0	11,600
Fair Value Measurements Level 1 [Member]
Non-marketable equity securities measured and recorded at fair value on a non-recurring basis
Non marketable equity securities fair value disclosure	0	0
Fair Value Measurements Level 2 [Member]
Non-marketable equity securities measured and recorded at fair value on a non-recurring basis
Non marketable equity securities fair value disclosure	0	0
Fair Value Measurements Level 3 [Member]
Non-marketable equity securities measured and recorded at fair value on a non-recurring basis
Non marketable equity securities fair value disclosure	$ 1,900	$ 1,900

This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the cost method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 18

-Paragraph 6

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 18

-Paragraph 6

-Subparagraph a

-Footnote 3a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration