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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Cash, Investments and Restricted Funds) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair value disclosure
Cash and cash equivalents	$ 120,772	$ 114,280
Short-term investments	56,401	56,838
Restricted cash		962
Concentrations of Credit Risk of Financial Instruments
Cash and cash equivalents which are not FDIC-insured	61,100	39,900
Cash deposits
Fair value disclosure
Cash and cash equivalents	86,510	92,520
Restricted cash		962
Variable rate demand notes
Fair value disclosure
Cash and cash equivalents	19,744	16,057
Money market funds
Fair value disclosure
Cash and cash equivalents	14,518	5,703
Certificates of deposit
Fair value disclosure
Short-term investments	$ 56,401	$ 56,838

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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