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INVESTMENTS (Tables) | 9 Months Ended
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Sep. 30, 2015
INVESTMENTS |
Summary of investments in held-to-maturity, available-for-sale and trading securities |
September 30, 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 |  | $ | 306,858 |  | $ | - |  | $ | - |  | $ | 306,858 |  | $ | - |  | $ | -
U.S. Treasuries |  | 92,994 |  | 5 |  | - |  | 92,999 |  | - |  | -
Certificates of deposit |  | 44,506 |  | - |  | - |  | 44,506 |  | - |  | -
Municipal securities |  | 611,370 |  | 319 |  | 10 |  | 611,679 |  | 10 |  | -
U.S. government agency securities |  | 487,495 |  | 23 |  | 4 |  | 487,514 |  | 4 |  | -
Long-term: |  |  |  |  |  |  |  |  |  |  |  |
Municipal securities |  | 29,333 |  | 16 |  | 4 |  | 29,345 |  | 4 |  | -
U.S. government agency securities |  | 5,022 |  | - |  | 3 |  | 5,019 |  | 3 |  | -
Total |  | $ | 1,577,578 |  | $ | 363 |  | $ | 21 |  | 1,577,920 |  | $ | 21 |  | $ | -
Trading |  |  |  |  |  |  |  |  |  |  |  |
Short-term: |  |  |  |  |  |  |  |  |  |  |  |
Auction rate securities |  |  |  |  |  |  |  | 1,487 |  |  |  |
Long-term: |  |  |  |  |  |  |  |  |  |  |  |
Auction rate securities |  |  |  |  |  |  |  | - |  |  |  |
Total |  |  |  |  |  |  |  | $ | 1,579,407 |  |  |  |
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 |  |  |  |
Summarizes the underlying contractual maturities of the Company's investments |
|  | September 30, 2015 |  | December 31, 2014
|  | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Less than 1 year: |  |  |  |  |  |  |  |
Commercial paper |  | $ | 306,858 |  | $ | 306,858 |  | $ | 19,482 |  | $ | 19,480
U.S. Treasuries |  | 92,994 |  | 92,999 |  | - |  | -
Certificates of deposit |  | 44,506 |  | 44,506 |  | - |  | -
Municipal securities |  | 611,370 |  | 611,679 |  | 744,542 |  | 744,647
U.S. government agency securities |  | 487,495 |  | 487,514 |  | 9,199 |  | 9,198
Due 1 - 10 years: |  |  |  |  |  |  |  |
Municipal securities |  | 29,333 |  | 29,345 |  | 42,940 |  | 42,950
U.S. government agency securities |  | 5,022 |  | 5,019 |  | - |  | -
Due 11 - 20 years: |  |  |  |  |  |  |  |
Auction rate securities |  | 1,487 |  | 1,487 |  | 3,910 |  | 3,910
Due 21 - 30 years: |  |  |  |  |  |  |  |
Variable rate demand notes |  | - |  | - |  | 4,001 |  | 4,001
Total |  | $ | 1,579,065 |  | $ | 1,579,407 |  | $ | 824,074 |  | $ | 824,186

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