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INVESTMENTS (Tables) | 9 Months Ended
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Sep. 30, 2012
INVESTMENTS |
Summary of investments in held-to-maturity, available-for-sale and trading securities |
September 30, 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: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  | $ | 17,015 |  |  | $ | 2 |  |  | $ | - |  |  | $ | 17,017 |  |  | $ | - |  |  | $ | - |
Municipal securities |  | 253,283 |  |  | - |  |  | 46 |  |  | 253,237 |  |  | 46 |  |  | - |
U.S. government agency securities |  | 29,982 |  |  | 3 |  |  | - |  |  | 29,985 |  |  | - |  |  | - |
Available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate demand notes |  | 6,501 |  |  | - |  |  | - |  |  | 6,501 |  |  | - |  |  | - |
Long-term: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Auction rate securities |  | 3,310 |  |  | - |  |  | - |  |  | 3,310 |  |  | - |  |  | - |
Total |  | $ | 310,091 |  |  | $ | 5 |  |  | $ | 46 |  |  | 310,050 |  |  | $ | 46 |  |  | $ | - |
Trading |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Auction rate securities |  |  |  |  |  |  |  |  |  |  | 873 |  |  |  |  |  |  |
Long-term: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Auction rate securities |  |  |  |  |  |  |  |  |  |  | 16,572 |  |  |  |  |  |  |
Total |  |  |  |  |  |  |  |  |  |  | $ | 327,495 |  |  |  |  |  |  |
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 (loss) recognized through earnings on trading securities |
|  | Three-Months Ended September 30, |  | Nine-Months Ended September 30,
|  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
(Loss) on transfer from available-for-sale to trading |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | (2,439 | )
Gain on trading securities sold |  | 27 |  |  | 1,335 |  |  | 1,100 |  |  | 3,351 |
Gain (loss) on trading securities held |  | 80 |  |  | (1,220 | ) |  | 579 |  |  | (1,201 | )
Gain (loss) on trading securites |  | $ | 107 |  |  | $ | 115 |  |  | $ | 1,679 |  |  | $ | (289 | )
Summarizes the underlying contractual maturities of the Company's investments |
|  | September 30, 2012 |  | December 31, 2011
|  | Amortized Cost |  | Fair Value |  |  | Amortized Cost |  |  | Fair Value |
Less than 1 year: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasuries |  | $ | - |  |  | $ | - |  |  | $ | 8,034 |  |  | $ | 8,039 |
Certificates of deposit |  | 17,015 |  |  | 17,017 |  |  | 29,034 |  |  | 29,035 |
Corporate bonds |  | - |  |  | - |  |  | 2,022 |  |  | 2,022 |
Municipal securities |  | 253,283 |  |  | 253,237 |  |  | 284,605 |  |  | 284,541 |
U.S. government agency securities |  | 29,982 |  |  | 29,985 |  |  | 16,005 |  |  | 16,007 |
Due 1 - 10 years: |  |  |  |  |  |  |  |  |  |  |  |
Variable rate demand notes |  | - |  |  | - |  |  | 5,775 |  |  | 5,775 |
Due 11 - 20 years: |  |  |  |  |  |  |  |  |  |  |  |
Variable rate demand notes |  | 3,000 |  |  | 3,000 |  |  | 12,716 |  |  | 12,716 |
Auction rate securities |  | 10,896 |  |  | 10,896 |  |  | 5,158 |  |  | 5,158 |
Due 21 - 30 years: |  |  |  |  |  |  |  |  |  |  |  |
Variable rate demand notes |  | 2,501 |  |  | 2,501 |  |  | 27,902 |  |  | 27,902 |
Auction rate securities |  | 9,859 |  |  | 9,859 |  |  | 25,134 |  |  | 25,134 |
Due 31 - 40 years: |  |  |  |  |  |  |  |  |  |  |  |
Variable rate demand notes |  | 1,000 |  |  | 1,000 |  |  | 12,532 |  |  | 12,532 |
Auction rate securities |  | - |  |  | - |  |  | 5,559 |  |  | 5,559 |
Total |  | $ | 327,536 |  |  | $ | 327,495 |  |  | $ | 434,476 |  |  | $ | 434,420 |

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