Cash, Cash Equivalents and Investments (Details 1) (USD $) In Thousands	Jul. 03, 2011	Dec. 31, 2010
Summary of available-for-sale investments
Amortized Cost	$ 305,310
Gross Unrealized Gains	245
Gross Unrealized Losses	(776)
Fair Value, Short-term investments	202,012	147,823
Fair Value, Total	304,779
Gross unrealized losses and fair value for available-for-sale investments
Fair Value, Less than 12 Months	169,016
Unrealized Losses, Less than 12 Months	(734)
Fair Value, 12 Months or Greater	14,180
Unrealized Losses, 12 Months or Greater	(42)
Fair Value	183,196
Unrealized Losses	(776)
Treasury bills [Member]
Summary of available-for-sale investments
Fair Value, Short-term investments	12,979	2,494
Fair Value, Long-term investments	691	0
Fair Value, Total	13,670
Treasury bills [Member] \| Short-term investments [Member]
Summary of available-for-sale investments
Amortized Cost	12,979
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value, Short-term investments	12,979
Treasury bills [Member] \| Long-term investments [Member]
Summary of available-for-sale investments
Amortized Cost	690
Gross Unrealized Gains	1
Gross Unrealized Losses	0
Fair Value, Long-term investments	691
Municipal bonds [Member]
Summary of available-for-sale investments
Fair Value, Short-term investments	86,029	75,457
Fair Value, Long-term investments	32,674	34,794
Fair Value, Total	118,703
Gross unrealized losses and fair value for available-for-sale investments
Fair Value, Less than 12 Months	39,174
Unrealized Losses, Less than 12 Months	(7)
Fair Value, 12 Months or Greater	0
Unrealized Losses, 12 Months or Greater	0
Fair Value	39,174
Unrealized Losses	(7)
Municipal bonds [Member] \| Short-term investments [Member]
Summary of available-for-sale investments
Amortized Cost	85,959
Gross Unrealized Gains	75
Gross Unrealized Losses	(5)
Fair Value, Short-term investments	86,029
Municipal bonds [Member] \| Long-term investments [Member]
Summary of available-for-sale investments
Amortized Cost	32,549
Gross Unrealized Gains	127
Gross Unrealized Losses	(2)
Corporate bonds [Member]
Summary of available-for-sale investments
Fair Value, Short-term investments	68,425	34,543
Fair Value, Long-term investments	37,319	36,762
Fair Value, Total	105,744
Gross unrealized losses and fair value for available-for-sale investments
Fair Value, Less than 12 Months	84,990
Unrealized Losses, Less than 12 Months	(515)
Fair Value, 12 Months or Greater	10,438
Unrealized Losses, 12 Months or Greater	(16)
Fair Value	95,428
Unrealized Losses	(531)
Corporate bonds [Member] \| Short-term investments [Member]
Summary of available-for-sale investments
Amortized Cost	68,528
Gross Unrealized Gains	15
Gross Unrealized Losses	(118)
Fair Value, Short-term investments	68,425
Corporate bonds [Member] \| Long-term investments [Member]
Summary of available-for-sale investments
Amortized Cost	37,732
Gross Unrealized Gains	0
Gross Unrealized Losses	(413)
Agency bonds [Member]
Summary of available-for-sale investments
Fair Value, Short-term investments	23,428	15,979
Fair Value, Long-term investments	14,988	21,025
Fair Value, Total	38,416
Gross unrealized losses and fair value for available-for-sale investments
Fair Value, Less than 12 Months	24,993
Unrealized Losses, Less than 12 Months	(149)
Fair Value, 12 Months or Greater	1,259
Unrealized Losses, 12 Months or Greater	(5)
Fair Value	26,252
Unrealized Losses	(154)
Agency bonds [Member] \| Short-term investments [Member]
Summary of available-for-sale investments
Amortized Cost	23,442
Gross Unrealized Gains	24
Gross Unrealized Losses	(38)
Fair Value, Short-term investments	23,428
Agency bonds [Member] \| Long-term investments [Member]
Summary of available-for-sale investments
Amortized Cost	15,103
Gross Unrealized Gains	1
Gross Unrealized Losses	(116)
Sovereign bonds [Member]
Summary of available-for-sale investments
Amortized Cost	10,387
Gross Unrealized Gains	2
Gross Unrealized Losses	(9)
Fair Value, Short-term investments	11,151	19,350
Fair Value, Long-term investments	10,380	0
Fair Value, Total	21,531
Gross unrealized losses and fair value for available-for-sale investments
Fair Value, Less than 12 Months	13,144
Unrealized Losses, Less than 12 Months	(23)
Fair Value, 12 Months or Greater	2,483
Unrealized Losses, 12 Months or Greater	(21)
Fair Value	15,627
Unrealized Losses	(44)
Sovereign bonds [Member] \| Short-term investments [Member]
Summary of available-for-sale investments
Amortized Cost	11,186
Gross Unrealized Gains	0
Gross Unrealized Losses	(35)
Fair Value, Short-term investments	11,151
Covered bonds [Member]
Summary of available-for-sale investments
Amortized Cost	6,755
Fair Value, Long-term investments	6,715	3,541
Fair Value, Total	6,715
Gross unrealized losses and fair value for available-for-sale investments
Fair Value, Less than 12 Months	6,715
Unrealized Losses, Less than 12 Months	(40)
Fair Value, 12 Months or Greater	0
Unrealized Losses, 12 Months or Greater	0
Fair Value	6,715
Unrealized Losses	(40)
Covered bonds [Member] \| Long-term investments [Member]
Summary of available-for-sale investments
Gross Unrealized Gains	0
Gross Unrealized Losses	$ (40)

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-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 FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 13, 19
-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 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563

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This item represents the gross unrealized losses for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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