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INVESTMENTS (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Held to Maturity and Available-for-sale |  |
Held to maturity and available-for-sale securities, Amortized Cost | $ 422,898 | $ 401,944
Held to maturity and available-for-sale securities, Gross Unrealized Holding Gains |  | 8
Held to maturity and available-for-sale securities, Gross Unrealized Holding Losses | 90 | 64
Held to maturity and available-for-sale securities, Fair Value | 422,808 | 401,888
Held to maturity and available-for-sale securities, Continuous Unrealized Loss Position less than 12 Months | 90 | 64
Held to Maturity, Available-for-sale, and Trading |  |
Total Fair Value | 441,362 | 434,420
Short-term | U.S. Treasuries |  |
Held-to-Maturity |  |
Amortized Cost | 402 | 8,034
Gross Unrealized Holding Gains |  | 5
Fair Value | 402 | 8,039
Short-term | Certificates of deposit |  |
Held-to-Maturity |  |
Amortized Cost | 37,594 | 29,034
Gross Unrealized Holding Gains |  | 1
Fair Value | 37,594 | 29,035
Short-term | Corporate bonds |  |
Held-to-Maturity |  |
Amortized Cost |  | 2,022
Fair Value |  | 2,022
Short-term | Municipal securities |  |
Held-to-Maturity |  |
Amortized Cost | 330,546 | 284,605
Gross Unrealized Holding Losses | 89 | 64
Fair Value | 330,457 | 284,541
Continuous Unrealized Loss Position less than 12 Months | 89 | 64
Short-term | U.S. government agency securities. |  |
Held-to-Maturity |  |
Amortized Cost | 19,988 | 16,005
Gross Unrealized Holding Gains |  | 2
Gross Unrealized Holding Losses | 1 |
Fair Value | 19,987 | 16,007
Continuous Unrealized Loss Position less than 12 Months | 1 |
Short-term | Variable rate demand notes |  |
Available-for-sale |  |
Amortized Cost | 31,058 | 58,924
Fair Value | 31,058 | 58,924
Short-term | Auction rate securities |  |
Trading |  |
Fair Value |  | 12,658
Long-term | Auction rate securities |  |
Available-for-sale |  |
Amortized Cost | 3,310 | 3,320
Fair Value | 3,310 | 3,320
Trading |  |
Fair Value | $ 18,554 | $ 19,874

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