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INVESTMENTS (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Held to Maturity and Available-for-sale
Held to maturity and available-for-sale securities, Amortized Cost	$ 432,537	$ 395,855
Held to maturity and available-for-sale securities, Gross Unrealized Holding Gains	25	48
Held to maturity and available-for-sale securities, Fair Value	432,562	395,903
Held to Maturity, Available-for-sale, and Trading
Total Fair Value	447,088	412,087
Short-term | Certificates of deposit
Held-to-Maturity
Amortized Cost	22,043	22,045
Fair Value	22,043	22,045
Short-term | Commercial paper
Held-to-Maturity
Amortized Cost	9,990	5,991
Fair Value	9,990	5,991
Short-term | Municipal securities
Held-to-Maturity
Amortized Cost	400,504	367,819
Gross Unrealized Holding Gains	25	48
Fair Value	400,529	367,867
Short-term | Auction rate securities
Trading
Fair Value	6,395	6,392
Long-term | Auction rate securities
Trading
Fair Value	$ 8,131	$ 9,792

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Represents the cost of debt and equity securities, which are categorized as held-to-maturity and available-for-sale, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Represents investments in debt securities which are categorized as held-to-maturity and available-for-sale; such investments are normally measured at amortized cost (carrying value) unless circumstances indicate that the value to be recovered from the investment is less than its carried amount. This element may be used in connection with the fair value disclosures required in footnote disclosures to the financial statements.

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Represents the gross unrealized gains for securities, at a point in time, which are categorized as held-to-maturity and available-for-sale securities.

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Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity.

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Amount before other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Fair value of investments in debt securities classified as held-to-maturity.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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