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INVESTMENTS (Tables) | 9 Months Ended
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Sep. 30, 2016
INVESTMENTS |
Summary of investments in held-to-maturity, available-for-sale and trading securities |
September 30, 2016 |  | 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 |  | $ | 28,318 |  | $ | - |  | $ | - |  | $ | 28,318 |  | $ | - |  | $ | -
Municipal securities |  | 181,843 |  | - |  | 222 |  | 181,621 |  | 222 |  | -
U.S. government agency securities |  | 26,080 |  | 1 |  | 3 |  | 26,078 |  | 3 |  | -
Long-term: |  |  |  |  |  |  |  |  |  |  |  |
Municipal securities |  | 9,519 |  | - |  | 19 |  | 9,500 |  | 19 |  | -
Available-for-Sale: |  |  |  |  |  |  |  |  |  |  |  |
Short-term: |  |  |  |  |  |  |  |  |  |  |  |
Variable rate demand notes |  | 21,412 |  | - |  | - |  | 21,412 |  | - |  | -
Total |  | $ | 267,172 |  | $ | 1 |  | $ | 244 |  | $ | 266,929 |  | $ | 244 |  | $ | -
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 |  | $ | -
Summarizes the underlying contractual maturities of the Company's investments |
|  | September 30, 2016 |  | December 31, 2015 |
|  | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value |
Less than 1 year: |  |  |  |  |  |  |  |  |
Commercial paper |  | $ | 28,318 |  | $ | 28,318 |  | $ | 3,978 |  | $ | 3,978 |
Municipal securities |  | 181,843 |  | 181,621 |  | 709,207 |  | 709,078 |
U.S. government agency securities |  | 26,080 |  | 26,078 |  | 23,369 |  | 23,311 |
U.S. Treasuries |  | - |  | - |  | 8,056 |  | 8,043 |
Due 1 -10 years: |  |  |  |  |  |  |  |  |
Municipal securities |  | 9,519 |  | 9,500 |  | 11,071 |  | 11,063 |
U.S. government agency securities |  | - |  | - |  | 4,277 |  | 4,252 |
Variable rate demand notes |  | 6,003 |  | 6,003 |  | - |  | - |
Due 11 - 20 years: |  |  |  |  |  |  |  |  |
Variable rate demand notes |  | 8,005 |  | 8,005 |  | - |  | - |
Due 21 - 30 years: |  |  |  |  |  |  |  |  |
Variable rate demand notes |  | 4,002 |  | 4,002 |  | - |  | - |
Due 31 - 40 years: |  |  |  |  |  |  |  |  |
Variable rate demand notes |  | 3,402 |  | 3,402 |  | - |  | - |
Total |  | $ | 267,172 |  | $ | 266,929 |  | $ | 759,958 |  | $ | 759,725 |

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