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INVESTMENTS - Maturity Period (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Investments |  |
Amortized Cost | $ 459,730 | $ 676,129
Fair Value | 459,508 | 675,299
Commercial paper | Less than 1 year |  |
Investments |  |
Amortized Cost | 52,595 | 81,026
Fair Value | 52,595 | 81,026
U.S. Treasuries | Less than 1 year |  |
Investments |  |
Amortized Cost | 109,832 |
Fair Value | 109,787 |
Municipal securities | Less than 1 year |  |
Investments |  |
Amortized Cost | 127,149 | 469,604
Fair Value | 127,069 | 468,865
Municipal securities | Due 1 - 10 years |  |
Investments |  |
Amortized Cost | 1,612 |
Fair Value | 1,610 |
U.S. government agency securities | Less than 1 year |  |
Investments |  |
Amortized Cost | 108,128 | 61,307
Fair Value | 108,033 | 61,219
U.S. government agency securities | Due 1 - 10 years |  |
Investments |  |
Amortized Cost |  | 2,369
Fair Value |  | 2,366
Certificates of deposit | Less than 1 year |  |
Investments |  |
Amortized Cost | 26,068 | 11,869
Fair Value | 26,068 | 11,869
Variable rate demand notes | Due 1 - 10 years |  |
Investments |  |
Amortized Cost |  | 6,366
Fair Value |  | 6,366
Variable rate demand notes | Due 11 - 20 years |  |
Investments |  |
Amortized Cost | 15,952 | 28,377
Fair Value | 15,952 | 28,377
Variable rate demand notes | Due 21 - 30 years |  |
Investments |  |
Amortized Cost | 14,291 | 15,211
Fair Value | 14,291 | $ 15,211
Variable rate demand notes | Due 31 - 40 years |  |
Investments |  |
Amortized Cost | 4,103 |
Fair Value | $ 4,103 |

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