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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Assets and Liabilities (Details) - Recurring basis - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Assets: |  |
Assets | $ 6,860 | $ 8,322
Liabilities: |  |
Liabilities | 94,664 | 94,155
Cash and cash equivalents |  |
Assets: |  |
Money market funds | 300 | 3,600
Other long-term assets |  |
Assets: |  |
Equity, bond, and money market mutual funds held in trust related to the Voluntary Savings Plan | 4,012 | 3,848
Interest rate swaps | 2,548 | 874
Other long-term liabilities |  |
Liabilities: |  |
Interest rate swap | 154 | 455
Contingent consideration | 94,510 | 93,700
Level 1 |  |
Assets: |  |
Assets | 4,312 | 7,448
Level 1 | Cash and cash equivalents |  |
Assets: |  |
Money market funds | 300 | 3,600
Level 1 | Other long-term assets |  |
Assets: |  |
Equity, bond, and money market mutual funds held in trust related to the Voluntary Savings Plan | 4,012 | 3,848
Level 2 |  |
Assets: |  |
Assets | 2,548 | 874
Liabilities: |  |
Liabilities | 154 | 455
Level 2 | Other long-term assets |  |
Assets: |  |
Interest rate swaps | 2,548 | 874
Level 2 | Other long-term liabilities |  |
Liabilities: |  |
Interest rate swap | 154 | 455
Level 3 |  |
Liabilities: |  |
Liabilities | 94,510 | 93,700
Level 3 | Other long-term liabilities |  |
Liabilities: |  |
Contingent consideration | $ 94,510 | $ 93,700

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