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INVESTMENTS (Details 3) (USD $)	3 Months Ended
INVESTMENTS (Details 3) (USD $)	Mar. 31, 2013	Dec. 31, 2012
INVESTMENTS
Realized gains on the sale of available-for-sale investments	$ 2,500,000
Disclosure of underlying contractual maturities of investments
Amortized Cost	115,770,000	115,952,000
Fair Value	115,804,000	118,424,000
U.S. Treasuries \| Less than 1 year
Disclosure of underlying contractual maturities of investments
Amortized Cost	16,023,000	16,040,000
Fair Value	16,025,000	16,040,000
Certificates of deposit \| Less than 1 year
Disclosure of underlying contractual maturities of investments
Amortized Cost	6,706,000	2,201,000
Fair Value	6,706,000	2,201,000
Municipal securities \| Less than 1 year
Disclosure of underlying contractual maturities of investments
Amortized Cost	75,671,000	77,038,000
Fair Value	75,703,000	77,027,000
Auction rate securities \| Due 11 - 20 years
Disclosure of underlying contractual maturities of investments
Amortized Cost	10,758,000	10,748,000
Fair Value	10,758,000	10,748,000
Auction rate securities \| Due 21 - 30 years
Disclosure of underlying contractual maturities of investments
Amortized Cost	6,612,000	9,925,000
Fair Value	$ 6,612,000	$ 12,408,000

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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