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INVESTMENTS - Maturity Period (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Investments |  |
Amortized Cost | $ 263,665 | $ 320,740
Fair Value | 263,697 | 320,650
Commercial paper | Less than 1 year |  |
Investments |  |
Amortized Cost | 38,964 | 52,838
Fair Value | 38,964 | 52,838
Municipal securities | Less than 1 year |  |
Investments |  |
Amortized Cost | 103,664 | 151,690
Fair Value | 103,690 | 151,644
U.S. government agency securities | Less than 1 year |  |
Investments |  |
Amortized Cost | 19,940 | 19,943
Fair Value | 19,945 | 19,931
Certificates of deposit | Less than 1 year |  |
Investments |  |
Amortized Cost | 5,024 | 14,075
Fair Value | 5,024 | 14,075
U.S. treasuries | Less than 1 year |  |
Investments |  |
Amortized Cost | 89,267 | 78,189
Fair Value | 89,268 | 78,157
Variable rate demand notes | Due 21 - 30 years |  |
Investments |  |
Amortized Cost | 5,805 | 4,005
Fair Value | 5,805 | $ 4,005
Variable rate demand notes | Due 31 - 40 years |  |
Investments |  |
Amortized Cost | 1,001 |
Fair Value | $ 1,001 |

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