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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Cash, Investments and Restricted Funds) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Fair value disclosure |  |
Cash and cash equivalents | $ 177,436 | $ 120,772
Short-term investments | 75,879 | 56,401
Concentrations of Credit Risk of Financial Instruments |  |
Cash and cash equivalents which are not FDIC-insured | 85,200 | 61,100
Cash deposits |  |
Fair value disclosure |  |
Cash and cash equivalents | 126,607 | 86,510
Variable rate demand notes |  |
Fair value disclosure |  |
Cash and cash equivalents | 17,980 | 19,744
Money market funds |  |
Fair value disclosure |  |
Cash and cash equivalents | 32,849 | 14,518
Certificates of deposit |  |
Fair value disclosure |  |
Short-term investments | $ 75,879 | $ 56,401

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