INVESTMENTS (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Investments, Current
Cost	$ 1,982,553	$ 1,302,722
Gross Unrealized Gains	1,357	731
Gross Unrealized Losses	(443)	(202)
Fair Value	1,983,467	1,303,251
Foreign government securities
Investments, Current
Cost	1,142,648	682,841
Gross Unrealized Gains	817	558
Gross Unrealized Losses	(386)	(81)
Fair Value	1,143,079	683,318
U.S. government securities
Investments, Current
Cost	757,002	469,116
Gross Unrealized Gains	357	158
Gross Unrealized Losses	(55)	(66)
Fair Value	757,304	469,208
U.S. agency securities
Investments, Current
Cost	52,538	109,920
Gross Unrealized Gains	9	15
Gross Unrealized Losses	(2)	(30)
Fair Value	52,545	109,905
U.S. Corporate Notes
Investments, Current
Cost	30,365	40,845
Gross Unrealized Gains	174
Gross Unrealized Losses		(25)
Fair Value	$ 30,539	$ 40,820

Total of debt securities categorized neither as held-to-maturity nor trading which are intended be sold or mature within one year from the balance sheet date or the normal operating cycle, whichever is longer.

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

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

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-Name Statement of Financial Accounting Standard (FAS)

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

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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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 10: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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+ Details