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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Assets and Liabilities) (Details) - Recurring basis - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Assets:
Assets	$ 19,024	$ 22,967
Cash and cash equivalents
Assets:
Money market funds	16,501	20,540
Other long-term assets
Assets:
Equity, bond, and money market mutual funds held in trust related to the Voluntary Savings Plan	2,523	2,427
Other long-term liabilities
Liabilities:
Interest rate swap	1,964	563
Level 1
Assets:
Assets	19,024	22,967
Level 1 | Cash and cash equivalents
Assets:
Money market funds	16,501	20,540
Level 1 | Other long-term assets
Assets:
Equity, bond, and money market mutual funds held in trust related to the Voluntary Savings Plan	2,523	2,427
Level 2 | Other long-term liabilities
Liabilities:
Interest rate swap	$ 1,964	$ 563

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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