INVESTMENTS (Details) (USD $)	Jun. 30, 2011	Dec. 31, 2010
Investments, Current
Cost	$ 1,338,090,000	$ 1,302,722,000
Gross Unrealized Gains	540,000	731,000
Gross Unrealized Losses	(461,000)	(202,000)
Fair Value	1,338,169,000	1,303,251,000
U.S. government securities
Investments, Current
Cost	586,504,000	469,116,000
Gross Unrealized Gains	334,000	158,000
Gross Unrealized Losses	(2,000)	(66,000)
Fair Value	586,836,000	469,208,000
Foreign government securities
Investments, Current
Cost	665,440,000	682,841,000
Gross Unrealized Gains	6,000	558,000
Gross Unrealized Losses	(458,000)	(81,000)
Fair Value	664,988,000	683,318,000
U.S. agency securities
Investments, Current
Cost	45,564,000	109,920,000
Gross Unrealized Gains	23,000	15,000
Gross Unrealized Losses		(30,000)
Fair Value	45,587,000	109,905,000
Corporate Notes
Investments, Current
Cost	40,582,000	40,845,000
Gross Unrealized Gains	177,000
Gross Unrealized Losses	(1,000)	(25,000)
Fair Value	40,758,000	40,820,000
Investments, Noncurrent
Long-term investments		400,000
Long-term investments reclassified as short-term investments	$ 400,000

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. Such securities are reported at fair value; unrealized gains and losses of such securities are excluded from earnings and included in other comprehensive income, a separate component of shareholders' equity, unless the Available-for-sale Security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain or loss of an Available-for-sale Security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge, as should other than temporary declines in fair value below costs basis.

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Total of debt securities categorized neither as held-to-maturity nor trading which are intended be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains and losses of such securities are excluded from earnings and included in other comprehensive income, a separate component of shareholders' equity, unless the Available-for-sale Security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain or loss of an Available-for-sale Security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge, as should other than temporary declines in fair value below costs basis.

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