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INVESTMENTS (Details 3) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Disclosure of underlying contractual maturities of investments
Amortized Cost	$ 325,297	$ 115,952
Fair Value	325,353	118,424
U.S. Treasuries \| Less than 1 year
Disclosure of underlying contractual maturities of investments
Amortized Cost		16,040
Fair Value		16,040
Certificates of deposit \| Less than 1 year
Disclosure of underlying contractual maturities of investments
Amortized Cost	6,515	2,201
Fair Value	6,515	2,201
Municipal securities \| Less than 1 year
Disclosure of underlying contractual maturities of investments
Amortized Cost	302,059	77,038
Fair Value	302,115	77,027
Auction rate securities \| Due 11 - 20 years
Disclosure of underlying contractual maturities of investments
Amortized Cost	10,861	10,748
Fair Value	10,861	10,748
Auction rate securities \| Due 21 - 30 years
Disclosure of underlying contractual maturities of investments
Amortized Cost	5,862	9,925
Fair Value	$ 5,862	$ 12,408

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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