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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Cash and Cash Equivalents and Short-term Investments) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair value disclosure
Cash and cash equivalents	$ 190,186	$ 120,772
Short-term investments	106,806	56,401
Concentrations of Credit Risk of Financial Instruments
Cash, cash equivalents and short-term deposits not FDIC-insured	94,700	61,100
Cash deposits
Fair value disclosure
Cash and cash equivalents	124,938	86,510
Variable rate demand notes
Fair value disclosure
Cash and cash equivalents	19,786	19,744
Money market funds
Fair value disclosure
Cash and cash equivalents	42,470	14,518
Certificates of deposit
Fair value disclosure
Short-term investments	82,949	$ 56,401
U.S. Treasury securities
Fair value disclosure
Cash and cash equivalents	2,992
Short-term investments	$ 23,857

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