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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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