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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Assets and Liabilities (Details) - Recurring basis - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Assets:
Assets	$ 52,761	$ 37,156
Cash and cash equivalents
Assets:
Money market funds	49,101	34,201
Other long-term assets
Assets:
Equity, bond, and money market mutual funds held in trust related to the Voluntary Savings Plan	3,306	2,955
Interest rate swaps	354
Other long-term liabilities
Liabilities:
Interest rate swap	973	1,622
Level 1
Assets:
Assets	52,407	37,156
Level 1 | Cash and cash equivalents
Assets:
Money market funds	49,101	34,201
Level 1 | Other long-term assets
Assets:
Equity, bond, and money market mutual funds held in trust related to the Voluntary Savings Plan	3,306	2,955
Level 2
Assets:
Assets	354
Level 2 | Other long-term assets
Assets:
Interest rate swaps	354
Level 2 | Other long-term liabilities
Liabilities:
Interest rate swap	$ 973	$ 1,622

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