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INVESTMENTS (Tables) | 12 Months Ended
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Dec. 31, 2015
INVESTMENTS |
Summary of investments in held-to-maturity, available-for-sale and trading securities |
December 31, 2015 |  | 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: |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  | $ | 3,978 |  | $ | - |  | $ | - |  | $ | 3,978 |  | $ | - |  | $ | - |
Municipal securities |  | 709,207 |  | 63 |  | 192 |  | 709,078 |  | 192 |  | - |
U.S. government agency securities |  | 23,369 |  | - |  | 58 |  | 23,311 |  | 58 |  | - |
U.S. Treasuries |  | 8,056 |  | - |  | 13 |  | 8,043 |  | 13 |  | - |
Long-term: |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal securities |  | 11,071 |  | - |  | 8 |  | 11,063 |  | 8 |  | - |
U.S. government agency securities |  | 4,277 |  | - |  | 25 |  | 4,252 |  | 25 |  | - |
Total |  | $ | 759,958 |  | $ | 63 |  | $ | 296 |  | $ | 759,725 |  | $ | 296 |  | $ | - |
December 31, 2014 |  | 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: |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  | $ | 19,482 |  | $ | - |  | $ | 2 |  | $ | 19,480 |  | $ | - |  | $ | - |
Municipal securities |  | 744,542 |  | 105 |  | - |  | 744,647 |  | - |  | - |
U.S. government agency securities |  | 9,199 |  | - |  | 1 |  | 9,198 |  | - |  | - |
Long-term: |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal securities |  | 42,940 |  | 10 |  | - |  | 42,950 |  | - |  | - |
Available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate demand notes |  | 4,001 |  | - |  | - |  | 4,001 |  | - |  | - |
Total |  | $ | 820,164 |  | $ | 115 |  | $ | 3 |  | 820,276 |  | $ | - |  | $ | - |
Trading |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term: |  |  |  |  |  |  |  |  |  |  |  |  |
Auction rate securities |  |  |  |  |  |  |  | 3,910 |  |  |  |  |
Long-term: |  |  |  |  |  |  |  |  |  |  |  |  |
Auction rate securities |  |  |  |  |  |  |  | - |  |  |  |  |
Total |  |  |  |  |  |  |  | $ | 824,186 |  |  |  |  |
Schedule of net gain (loss) recognized through earnings on trading securities |
|  | 2015 |  | 2014 |  | 2013 |
Gain (loss) on transfer from available-for-sale to trading |  | $ | - |  | $ | - |  | $ | - |
Gain on trading securities sold |  | 250 |  | 978 |  | 255 |
(Loss) gain on trading securities held |  | - |  | (177) |  | 816 |
Gain on trading securites |  | $ | 250 |  | $ | 801 |  | $ | 1,071 |
Summarizes the underlying contractual maturities of the Company's investments |
|  | December 31, 2015 |  | December 31, 2014 |
|  | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value |
Less than 1 year: |  |  |  |  |  |  |  |  |
Commercial paper |  | $ | 3,978 |  | $ | 3,978 |  | $ | 19,482 |  | $ | 19,480 |
Municipal securities |  | 709,207 |  | 709,078 |  | 744,542 |  | 744,647 |
U.S. government agency securities |  | 23,369 |  | 23,311 |  | 9,199 |  | 9,198 |
U.S. Treasuries |  | 8,056 |  | 8,043 |  | - |  | - |
Due 1 -10 years: |  |  |  |  |  |  |  |  |
Municipal securities |  | 11,071 |  | 11,063 |  | 42,940 |  | 42,950 |
U.S. government agency securities |  | 4,277 |  | 4,252 |  | - |  | - |
Due 11 - 20 years: |  |  |  |  |  |  |  |  |
Auction rate securities |  | - |  | - |  | 3,910 |  | 3,910 |
Due 21 - 30 years: |  |  |  |  |  |  |  |  |
Variable rate demand notes |  | - |  | - |  | 4,001 |  | 4,001 |
Total |  | $ | 759,958 |  | $ | 759,725 |  | $ | 824,074 |  | $ | 824,186 |

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