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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Assets and Liabilities (Details) - Recurring basis - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets: |  |
Assets | $ 39,369 | $ 37,156
Cash and cash equivalents |  |
Assets: |  |
Money market funds | 36,001 | 34,201
Other long-term assets |  |
Assets: |  |
Equity, bond, and money market mutual funds held in trust related to the Voluntary Savings Plan | 3,017 | 2,955
Interest rate swaps | 351 |
Other long-term liabilities |  |
Liabilities: |  |
Interest rate swap | 1,194 | 1,622
Level 1 |  |
Assets: |  |
Assets | 39,018 | 37,156
Level 1 | Cash and cash equivalents |  |
Assets: |  |
Money market funds | 36,001 | 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 | 3,017 | 2,955
Level 2 |  |
Assets: |  |
Assets | 351 |
Level 2 | Other long-term assets |  |
Assets: |  |
Interest rate swaps | 351 |
Level 2 | Other long-term liabilities |  |
Liabilities: |  |
Interest rate swap | $ 1,194 | $ 1,622

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