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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
Fair value disclosure |  |  |  |
Cash and cash equivalents | $ 164,973 | $ 157,042 | $ 105,354 | $ 90,702
Short-term investments | 61,597 | 45,909 |  |
Restricted cash | 1,384 | 1,386 |  |
Concentrations of Credit Risk of Financial Instruments |  |  |  |
Cash and cash equivalents which are not FDIC-insured | 69,900 | 77,300 |  |
Cash deposits |  |  |  |
Fair value disclosure |  |  |  |
Cash and cash equivalents | 110,279 | 99,615 |  |
Restricted cash | 1,384 | 1,386 |  |
Variable rate demand notes |  |  |  |
Fair value disclosure |  |  |  |
Cash and cash equivalents | 29,790 | 16,326 |  |
Money market funds |  |  |  |
Fair value disclosure |  |  |  |
Cash and cash equivalents | 24,904 | 41,101 |  |
Certificates of deposit |  |  |  |
Fair value disclosure |  |  |  |
Short-term investments | $ 61,597 | $ 45,909 |  |

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