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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Cash and Cash Equivalents and Short-term Investments) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Fair value disclosure |  |
Cash and cash equivalents | $ 183,838 | $ 190,186
Short-term investments | 124,257 | 106,806
Concentrations of Credit Risk of Financial Instruments |  |
Cash, cash equivalents and short-term investments not FDIC-insured | 54,400 | 94,700
Cash deposits |  |
Fair value disclosure |  |
Cash and cash equivalents | 159,249 | 124,938
Variable rate demand notes |  |
Fair value disclosure |  |
Cash and cash equivalents | 14,647 | 19,786
Money market funds |  |
Fair value disclosure |  |
Cash and cash equivalents | 9,942 | 42,470
Certificates of deposit |  |
Fair value disclosure |  |
Short-term investments | 75,175 | 82,949
U.S. Treasury securities |  |
Fair value disclosure |  |
Cash and cash equivalents |  | 2,992
Short-term investments | $ 49,082 | $ 23,857

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