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INVESTMENTS (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Held to Maturity and Available-for-sale
Held to maturity and available-for-sale securities, Amortized Cost	$ 395,855	$ 98,589
Held to maturity and available-for-sale securities, Gross Unrealized Holding Gains	48	2,483
Held to maturity and available-for-sale securities, Gross Unrealized Holding Losses		11
Held to maturity and available-for-sale securities, Fair Value	395,903	101,061
Held to maturity and available-for-sale securities, Continuous Unrealized Loss Position less than 12 Months		11
Held to Maturity, Available-for-sale, and Trading
Total Fair Value	412,087	118,424
Short-term | U.S. Treasuries
Held-to-Maturity
Amortized Cost		16,040
Fair Value		16,040
Short-term | Certificates of deposit
Held-to-Maturity
Amortized Cost	22,045	2,201
Fair Value	22,045	2,201
Short-term | Commercial paper
Held-to-Maturity
Amortized Cost	5,991
Fair Value	5,991
Short-term | Municipal securities
Held-to-Maturity
Amortized Cost	367,819	77,038
Gross Unrealized Holding Gains	48
Gross Unrealized Holding Losses		11
Fair Value	367,897	77,027
Continuous Unrealized Loss Position less than 12 Months		11
Short-term | Auction rate securities
Trading
Fair Value	6,392	1,763
Long-term | Auction rate securities
Available-for-sale
Amortized Cost		3,310
Gross Unrealized Holding Gains		2,483
Fair Value		5,793
Trading
Fair Value	$ 9,792	$ 15,600

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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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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