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INVESTMENTS (Tables) | 12 Months Ended
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Dec. 31, 2012
INVESTMENTS |
Summary of investments in held-to-maturity, available-for-sale and trading securities |
December 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 |  | $ | 16,040 |  |  |  | $ | - |  |  |  | $ | - |  |  |  | $ | 16,040 |  |  |  | $ | - |  |  |  | $ | - |  |
Certificates of deposit |  | 2,201 |  |  |  | - |  |  |  | - |  |  |  | 2,201 |  |  |  | - |  |  |  | - |  |
Municipal securities |  | 77,038 |  |  |  | - |  |  |  | 11 |  |  |  | 77,027 |  |  |  | 11 |  |  |  | - |  |
Available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Auction rate securities |  | 3,310 |  |  |  | 2,483 |  |  |  | - |  |  |  | 5,793 |  |  |  | - |  |  |  | - |  |
Total |  | $ | 98,589 |  |  |  | $ | 2,483 |  |  |  | $ | 11 |  |  |  | 101,061 |  |  |  | $ | 11 |  |  |  | $ | - |  |
Trading |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Auction rate securities |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,763 |  |  |  |  |  |  |  |  |  |
Long-term: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Auction rate securities |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,600 |  |  |  |  |  |  |  |  |  |
Total |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 118,424 |  |  |  |  |  |  |  |  |  |
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 |
|  | 2012 |  |  |  | 2011 |  |  |  | 2010 |  |
(Loss) on transfer from available-for-sale to trading |  | $ | - |  |  |  | $ | (2,438 | ) |  |  | $ | (4,876 | ) |
Gain on trading securities sold |  | 1,130 |  |  |  | 2,604 |  |  |  | 375 |  |
Gain (loss) on trading securities held |  | 753 |  |  |  | (210 | ) |  |  | 572 |  |
Gain (loss) on trading securites |  | $ | 1,883 |  |  |  | $ | (44 | ) |  |  | $ | (3,929 | ) |
Summarizes the underlying contractual maturities of the Company's investments |
|  | December 31, 2012 |  |  |  | December 31, 2011 |
|  | Amortized Cost |  |  |  | Fair Value |  |  |  | Amortized Cost |  |  |  | Fair Value |
Less than 1 year: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasuries |  | $ | 16,040 |  |  |  | $ | 16,040 |  |  |  | $ | 8,034 |  |  |  | $ | 8,039 |
Certificates of deposit |  | 2,201 |  |  |  | 2,201 |  |  |  | 29,034 |  |  |  | 29,035 |
Corporate bonds |  | - |  |  |  | - |  |  |  | 2,022 |  |  |  | 2,022 |
Municipal securities |  | 77,038 |  |  |  | 77,027 |  |  |  | 284,605 |  |  |  | 284,541 |
U.S. government agency securities |  | - |  |  |  | - |  |  |  | 16,005 |  |  |  | 16,007 |
Due 1 - 10 years: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate demand notes |  | - |  |  |  | - |  |  |  | 5,775 |  |  |  | 5,775 |
Due 11 - 20 years: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate demand notes |  | - |  |  |  | - |  |  |  | 12,716 |  |  |  | 12,716 |
Auction rate securities |  | 10,748 |  |  |  | 10,748 |  |  |  | 5,158 |  |  |  | 5,158 |
Due 21 - 30 years: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate demand notes |  | - |  |  |  | - |  |  |  | 27,902 |  |  |  | 27,902 |
Auction rate securities |  | 9,925 |  |  |  | 12,408 |  |  |  | 25,134 |  |  |  | 25,134 |
Due 31 - 40 years: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate demand notes |  | - |  |  |  | - |  |  |  | 12,532 |  |  |  | 12,532 |
Auction rate securities |  | - |  |  |  | - |  |  |  | 5,559 |  |  |  | 5,559 |
Total |  | $ | 115,952 |  |  |  | $ | 118,424 |  |  |  | $ | 434,476 |  |  |  | $ | 434,420 |

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