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INVESTMENTS (Tables) | 3 Months Ended
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Mar. 31, 2012
INVESTMENTS |
Summary of investments in held-to-maturity, available-for-sale and trading securities |
March 31, 2012 |  | Amortized Cost |  | Gross Unrealized Holding Gains |  | Gross Unrealized Holding Losses |  | Fair Value |  | Continuous Unrealized Loss Position less than 12 Months |  | Continuous Unrealized Loss Position greater than 12 Months |
Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasuries |  | $ | 402 |  | $ | - |  | $ | - |  | $ | 402 |  | $ | - |  | $ | - |
Certificates of deposit |  | 37,594 |  | - |  | - |  | 37,594 |  | - |  | - |
Municipal securities |  | 330,546 |  | - |  | 89 |  | 330,457 |  | 89 |  | - |
U.S. government agency securities |  | 19,988 |  | - |  | 1 |  | 19,987 |  | 1 |  | - |
Available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term: |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate demand notes |  | 31,058 |  | - |  | - |  | 31,058 |  | - |  | - |
Long-term: |  |  |  |  |  |  |  |  |  |  |  |  |
Auction rate securities |  | 3,310 |  | - |  | - |  | 3,310 |  | - |  | - |
Total |  | $ | 422,898 |  | $ | - |  | $ | 90 |  | 422,808 |  | $ | 90 |  | $ | - |
Trading |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term: |  |  |  |  |  |  |  |  |  |  |  |  |
Auction rate securities |  |  |  |  |  |  |  | - |  |  |  |  |
Long-term: |  |  |  |  |  |  |  |  |  |  |  |  |
Auction rate securities |  |  |  |  |  |  |  | 18,554 |  |  |  |  |
Total |  |  |  |  |  |  |  | $ | 441,362 |  |  |  |  |
December 31, 2011 |  | Amortized Cost |  | Gross Unrealized Holding Gains |  | Gross Unrealized Holding Losses |  | Fair Value |  | Continuous Unrealized Loss Position less than 12 Months |  | Continuous Unrealized Loss Position greater than 12 Months |
Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasuries |  | $ | 8,034 |  | $ | 5 |  | $ | - |  | $ | 8,039 |  | $ | - |  | $ | - |
Certificates of deposit |  | 29,034 |  | 1 |  | - |  | 29,035 |  | - |  | - |
Corporate bonds |  | 2,022 |  | - |  | - |  | 2,022 |  | - |  | - |
Municipal securities |  | 284,605 |  | - |  | 64 |  | 284,541 |  | 64 |  | - |
U.S. government agency securities |  | 16,005 |  | 2 |  | - |  | 16,007 |  | - |  | - |
Available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term: |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate demand notes |  | 58,924 |  | - |  | - |  | 58,924 |  | - |  | - |
Long-term: |  |  |  |  |  |  |  |  |  |  |  |  |
Auction rate securities |  | 3,320 |  | - |  | - |  | 3,320 |  | - |  | - |
Total |  | $ | 401,944 |  | $ | 8 |  | $ | 64 |  | 401,888 |  | $ | 64 |  | $ | - |
Trading |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term: |  |  |  |  |  |  |  |  |  |  |  |  |
Auction rate securities |  |  |  |  |  |  |  | 12,658 |  |  |  |  |
Long-term: |  |  |  |  |  |  |  |  |  |  |  |  |
Auction rate securities |  |  |  |  |  |  |  | 19,874 |  |  |  |  |
Total |  |  |  |  |  |  |  | $ | 434,420 |  |  |  |  |
Schedule of net gain recognized through earnings on trading securities |
|  | Three-Months Ended March 31, |
|  | 2012 |  | 2011 |
Gain on transfer from available-for-sale to trading |  | $ | - |  | $ | - |
Gain on trading securities sold |  | 1,034 |  | 126 |
Gain on trading securities held |  | 753 |  | 152 |
Gain on trading securites |  | $ | 1,787 |  | $ | 278 |
Summarizes the underlying contractual maturities of the Company's investments |
|  | March 31, 2012 |  | December 31, 2011 |
|  | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value |
Less than 1 year: |  |  |  |  |  |  |  |  |
U.S. Treasuries |  | $ | 402 |  | $ | 402 |  | $ | 8,034 |  | $ | 8,039 |
Certificates of deposit |  | 37,594 |  | 37,594 |  | 29,034 |  | 29,035 |
Corporate bonds |  | - |  | - |  | 2,022 |  | 2,022 |
Municipal securities |  | 330,546 |  | 330,457 |  | 284,605 |  | 284,541 |
U.S. government agency securities |  | 19,988 |  | 19,987 |  | 16,005 |  | 16,007 |
Due 1 - 10 years: |  |  |  |  |  |  |  |  |
Variable rate demand notes |  | - |  | - |  | 5,775 |  | 5,775 |
Due 11 - 20 years: |  |  |  |  |  |  |  |  |
Variable rate demand notes |  | 6,801 |  | 6,801 |  | 12,716 |  | 12,716 |
Auction rate securities |  | 5,350 |  | 5,350 |  | 5,158 |  | 5,158 |
Due 21 - 30 years: |  |  |  |  |  |  |  |  |
Variable rate demand notes |  | 18,082 |  | 18,082 |  | 27,902 |  | 27,902 |
Auction rate securities |  | 16,514 |  | 16,514 |  | 25,134 |  | 25,134 |
Due 31 - 40 years: |  |  |  |  |  |  |  |  |
Variable rate demand notes |  | 6,175 |  | 6,175 |  | 12,532 |  | 12,532 |
Auction rate securities |  | - |  | - |  | 5,559 |  | 5,559 |
Total |  | $ | 441,452 |  | $ | 441,362 |  | $ | 434,476 |  | $ | 434,420 |

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