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INVESTMENTS - Maturity Period (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Investments |  |
Amortized Cost | $ 589,337 | $ 676,129
Fair Value | 588,719 | 675,299
Commercial paper | Less than 1 year |  |
Investments |  |
Amortized Cost | 42,288 | 81,026
Fair Value | 42,288 | 81,026
Municipal securities | Less than 1 year |  |
Investments |  |
Amortized Cost | 441,360 | 469,604
Fair Value | 440,852 | 468,865
Municipal securities | Due 1 - 10 years |  |
Investments |  |
Amortized Cost | 527 |
Fair Value | 527 |
U.S. government agency securities | Less than 1 year |  |
Investments |  |
Amortized Cost | 74,773 | 61,307
Fair Value | 74,666 | 61,219
U.S. government agency securities | Due 1 - 10 years |  |
Investments |  |
Amortized Cost | 2,973 | 2,369
Fair Value | 2,970 | 2,366
Certificates of deposit | Less than 1 year |  |
Investments |  |
Amortized Cost |  | 11,869
Fair Value |  | 11,869
Variable rate demand notes | Due 1 - 10 years |  |
Investments |  |
Amortized Cost | 6,622 | 6,366
Fair Value | 6,622 | 6,366
Variable rate demand notes | Due 11 - 20 years |  |
Investments |  |
Amortized Cost | 18,542 | 28,377
Fair Value | 18,542 | 28,377
Variable rate demand notes | Due 21 - 30 years |  |
Investments |  |
Amortized Cost | 2,252 | 15,211
Fair Value | $ 2,252 | $ 15,211

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