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INVESTMENTS - Maturity Period (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Investments |  |
Amortized Cost | $ 320,740 | $ 676,129
Fair Value | 320,650 | 675,299
Commercial paper | Less than 1 year |  |
Investments |  |
Amortized Cost | 52,838 | 81,026
Fair Value | 52,838 | 81,026
Municipal securities | Less than 1 year |  |
Investments |  |
Amortized Cost | 151,690 | 469,604
Fair Value | 151,644 | 468,865
U.S. government agency securities | Less than 1 year |  |
Investments |  |
Amortized Cost | 19,943 | 61,307
Fair Value | 19,931 | 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 | 14,075 | 11,869
Fair Value | 14,075 | 11,869
U.S. Treasuries | Less than 1 year |  |
Investments |  |
Amortized Cost | 78,189 |
Fair Value | 78,157 |
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 |  | 28,377
Fair Value |  | 28,377
Variable rate demand notes | Due 21 - 30 years |  |
Investments |  |
Amortized Cost | 4,005 | 15,211
Fair Value | $ 4,005 | $ 15,211

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