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INVESTMENTS - HTM & AFS (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Available-for-sale |  |
Amortized Cost | $ 209,904 | $ 223,144
Gross Unrealized Holding Gains | 2 |
Gross Unrealized Holding Losses | 63 | 196
Fair Value | 209,843 | 222,948
Continuous Unrealized Loss Position less than 12 Months | 61 | 196
Short-term | Commercial paper |  |
Available-for-sale |  |
Amortized Cost | 50,623 | 40,382
Fair Value | 50,623 | 40,382
Short-term | Certificates of deposit |  |
Available-for-sale |  |
Amortized Cost | 3,164 |
Fair Value | 3,164 |
Short-term | Municipal securities |  |
Available-for-sale |  |
Amortized Cost | 119,833 | 140,379
Gross Unrealized Holding Gains | 2 |
Gross Unrealized Holding Losses | 56 | 181
Fair Value | 119,779 | 140,198
Continuous Unrealized Loss Position less than 12 Months | 54 | 181
Short-term | U.S. government agency securities |  |
Available-for-sale |  |
Amortized Cost | 10,076 | 26,057
Gross Unrealized Holding Losses | 6 | 6
Fair Value | 10,070 | 26,051
Continuous Unrealized Loss Position less than 12 Months | 6 | 6
Short-term | Variable rate demand notes |  |
Available-for-sale |  |
Amortized Cost | 25,730 | 13,923
Fair Value | 25,730 | 13,923
Long-term | Municipal securities |  |
Available-for-sale |  |
Amortized Cost | 478 | 2,403
Gross Unrealized Holding Losses | 1 | 9
Fair Value | 477 | 2,394
Continuous Unrealized Loss Position less than 12 Months | $ 1 | $ 9

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