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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2011

Fair Value Measurements [Abstract]

Financial Assets Measured At Fair Value On Recurring Basis

		December 31, 2010
		Fair value measurements using input type
		Level 1				Level 2				Level 3				Total
Cash equivalents:
Money market funds		$	226,092			$	—			$	—			$	226,092
Government and corporate debentures - fixed interest rate							7,932								7,932
Marketable securities:
Government and corporate debentures - fixed interest rate			—				1,323,370				—				1,323,370
Government-sponsored enterprises			—				332,799				—				332,799
Government and corporate debentures - floating interest rate			—				199,010				—				199,010
Auction rate securities			—				—				7,990				7,990
Foreign currency derivative contracts			—				1,219				—				1,219
Total financials assets		$	226,092			$	1,864,330			$	7,990			$	2,098,412

		December 31, 2011
		Fair value measurements using input type
		Level 1				Level 2				Level 3				Total
Cash equivalents:
Money market funds		$	303,780			$	—			$	—			$	303,780
Marketable securities:
Government and corporate debentures - fixed interest rate			—				1,624,096				—				1,624,096
Government-sponsored enterprises			—				337,471				—				337,471
Government and corporate debentures - floating interest rate			—				195,759				—				195,759
Auction rate securities			—				—				6,078				6,078
Foreign currency derivative contracts			—				(351	)			—				(351	)
Total financials assets		$	303,780			$	2,156,975			$	6,078			$	2,466,833

Fair Value Measurements Using Significant Unobservable Inputs

		Auction rate securities
Balance at January 1, 2010		$	8,775
Unrealized losses included in earning (other than temporary impairment)			(785	)
Balance at December 31, 2010			7,990
Securities sold during 2011			(1,912	)
Balance at December 31, 2011		$	6,078

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- Definition

Fair Value, Assets Measured Using Unobservable Inputs [Table Text Block]

+ References

No definition available.

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- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19190-110258



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-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 Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 6

-Footnote 4

-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 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

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