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INVESTMENTS - Maturity Period (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Investments |  |
Amortized Cost | $ 372,582 | $ 223,144
Fair Value | 372,490 | 222,948
Commercial paper | Less than 1 year |  |
Investments |  |
Amortized Cost | 73,037 | 40,382
Fair Value | 73,040 | 40,382
Certificates of deposit | Less than 1 year |  |
Investments |  |
Amortized Cost | 37,210 |
Fair Value | 37,210 |
Municipal securities | Less than 1 year |  |
Investments |  |
Amortized Cost | 152,287 | 140,379
Fair Value | 152,253 | 140,198
Municipal securities | Due 1 - 10 years |  |
Investments |  |
Amortized Cost | 32,704 | 2,403
Fair Value | 32,687 | 2,394
U.S. government agency securities | Less than 1 year |  |
Investments |  |
Amortized Cost | 28,465 | 26,057
Fair Value | 28,443 | 26,051
U.S. government agency securities | Due 1 - 10 years |  |
Investments |  |
Amortized Cost | 15,974 |
Fair Value | 15,952 |
Variable rate demand notes | Due 1 - 10 years |  |
Investments |  |
Amortized Cost | 3,918 | 3,917
Fair Value | 3,918 | 3,917
Variable rate demand notes | Due 11 - 20 years |  |
Investments |  |
Amortized Cost | 10,006 | 6,003
Fair Value | 10,006 | 6,003
Variable rate demand notes | Due 21 - 30 years |  |
Investments |  |
Amortized Cost | 14,979 | 4,003
Fair Value | 14,979 | $ 4,003
Variable rate demand notes | Due 31 - 40 years |  |
Investments |  |
Amortized Cost | 4,002 |
Fair Value | $ 4,002 |

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