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INVESTMENTS (Details 2) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Disclosure of underlying contractual maturities of investments
Amortized Cost	$ 438,944	$ 291,246
Fair Value	438,853	288,813
Less than 1 year \| U.S. Treasuries
Disclosure of underlying contractual maturities of investments
Amortized Cost	46,140	66,521
Fair Value	46,152	66,519
Less than 1 year \| Certificates of deposit
Disclosure of underlying contractual maturities of investments
Amortized Cost	33,847	7,004
Fair Value	33,847	7,004
Less than 1 year \| Corporate bonds
Disclosure of underlying contractual maturities of investments
Amortized Cost	2,021
Fair Value	2,021
Less than 1 year \| Municipal securities
Disclosure of underlying contractual maturities of investments
Amortized Cost	204,736	71,266
Fair Value	204,634	71,251
U.S. government agency securities \| Less than 1 year
Disclosure of underlying contractual maturities of investments
Amortized Cost	46,013	19,688
Fair Value	46,012	19,680
Due 1 - 10 years \| Variable rate demand notes
Disclosure of underlying contractual maturities of investments
Amortized Cost	5,775	3,001
Fair Value	5,775	3,001
Due 11 - 20 years \| Variable rate demand notes
Disclosure of underlying contractual maturities of investments
Amortized Cost	15,801	11,002
Fair Value	15,801	11,002
Due 21 - 30 years \| Variable rate demand notes
Disclosure of underlying contractual maturities of investments
Amortized Cost	32,703	30,426
Fair Value	32,703	30,426
Due 31 - 40 years \| Variable rate demand notes
Disclosure of underlying contractual maturities of investments
Amortized Cost	12,532	11,678
Fair Value	12,532	11,678
Due 11 - 20 years \| Auction rate securities
Disclosure of underlying contractual maturities of investments
Amortized Cost	12,174	10,305
Fair Value	12,174	9,819
Due 21 - 30 years \| Auction rate securities
Disclosure of underlying contractual maturities of investments
Amortized Cost	27,202	48,779
Fair Value	27,202	46,857
Due 31 - 40 years \| Auction rate securities
Disclosure of underlying contractual maturities of investments
Amortized Cost		11,576
Fair Value		$ 11,576

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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