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INVESTMENTS (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Available-for-sale |  |
Amortized Cost | $ 372,582 | $ 223,144
Gross Unrealized Holding Gains | 11 |
Gross Unrealized Holding Losses | 103 | 196
Fair Value | 372,490 | 222,948
Continuous Unrealized Loss Position less than 12 Months | 103 | 196
Short-term | Commercial paper |  |
Available-for-sale |  |
Amortized Cost | 73,037 | 40,382
Gross Unrealized Holding Gains | 3 |
Fair Value | 73,040 | 40,382
Short-term | Certificates of deposit |  |
Available-for-sale |  |
Amortized Cost | 37,210 |
Fair Value | 37,210 |
Short-term | Municipal securities |  |
Available-for-sale |  |
Amortized Cost | 152,287 | 140,379
Gross Unrealized Holding Gains | 8 |
Gross Unrealized Holding Losses | 42 | 181
Fair Value | 152,253 | 140,198
Continuous Unrealized Loss Position less than 12 Months | 42 | 181
Short-term | U.S. government agency securities |  |
Available-for-sale |  |
Amortized Cost | 28,465 | 26,057
Gross Unrealized Holding Losses | 22 | 6
Fair Value | 28,443 | 26,051
Continuous Unrealized Loss Position less than 12 Months | 22 | 6
Short-term | Variable rate demand notes |  |
Available-for-sale |  |
Amortized Cost | 32,905 | 13,923
Fair Value | 32,905 | 13,923
Long-term | Municipal securities |  |
Available-for-sale |  |
Amortized Cost | 32,704 | 2,403
Gross Unrealized Holding Losses | 17 | 9
Fair Value | 32,687 | 2,394
Continuous Unrealized Loss Position less than 12 Months | 17 | $ 9
Long-term | U.S. government agency securities |  |
Available-for-sale |  |
Amortized Cost | 15,974 |
Gross Unrealized Holding Losses | 22 |
Fair Value | 15,952 |
Continuous Unrealized Loss Position less than 12 Months | $ 22 |

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