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INVESTMENTS (Tables) | 3 Months Ended
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Mar. 31, 2016
INVESTMENTS |
Summary of investments in held-to-maturity, available-for-sale and trading securities |
March 31, 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 |  | $ | 7,969 |  | $ | - |  | $ | - |  | $ | 7,969 |  | $ | - |  | $ | -
Municipal securities |  | 464,865 |  | 22 |  | 148 |  | 464,739 |  | 148 |  | -
U.S. government agency securities |  | 17,316 |  | 1 |  | 7 |  | 17,310 |  | 7 |  | -
U.S. Treasuries |  | 18,093 |  | 1 |  | - |  | 18,094 |  | - |  | -
Long-term: |  |  |  |  |  |  |  |  |  |  |  |
Municipal securities |  | 7,419 |  | - |  | 8 |  | 7,411 |  | 8 |  | -
Total |  | $ | 515,662 |  | $ | 24 |  | $ | 163 |  | $ | 515,523 |  | $ | 163 |  | $ | -
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 |
|  | March 31, 2016 |  | December 31, 2015
|  | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Less than 1 year: |  |  |  |  |  |  |  |
Commercial paper |  | $ | 7,969 |  | $ | 7,969 |  | $ | 3,978 |  | $ | 3,978
Municipal securities |  | 464,865 |  | 464,739 |  | 709,207 |  | 709,078
U.S. government agency securities |  | 17,316 |  | 17,310 |  | 23,369 |  | 23,311
U.S. Treasuries |  | 18,093 |  | 18,094 |  | 8,056 |  | 8,043
Due 1 -10 years: |  |  |  |  |  |  |  |
Municipal securities |  | 5,334 |  | 5,328 |  | 11,071 |  | 11,063
U.S. government agency securities |  | - |  | - |  | 4,277 |  | 4,252
Due 11 - 20 years: |  |  |  |  |  |  |  |
Municipal securities |  | 2,085 |  | 2,083 |  | - |  | -
Total |  | $ | 515,662 |  | $ | 515,523 |  | $ | 759,958 |  | $ | 759,725

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