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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Assets and Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Liabilities: |  |
Contingent consideration, noncurrent | $ 100,220 | $ 92,900
Recurring basis |  |
Assets: |  |
Assets | 38,235 | 100,091
Recurring basis | Cash and cash equivalents |  |
Assets: |  |
Money market funds | 32,200 | 93,754
Recurring basis | Other long-term assets |  |
Assets: |  |
Equity, bond, and money market mutual funds held in trust related to the Voluntary Savings Plan | 4,821 | 4,627
Interest rate swap | 1,214 | 1,710
Recurring basis | Other long-term liabilities |  |
Liabilities: |  |
Contingent consideration, noncurrent | 100,220 | 92,900
Recurring basis | Level 1 |  |
Assets: |  |
Assets | 37,021 | 98,381
Recurring basis | Level 1 | Cash and cash equivalents |  |
Assets: |  |
Money market funds | 32,200 | 93,754
Recurring basis | Level 1 | Other long-term assets |  |
Assets: |  |
Equity, bond, and money market mutual funds held in trust related to the Voluntary Savings Plan | 4,821 | 4,627
Recurring basis | Level 2 |  |
Assets: |  |
Assets | 1,214 | 1,710
Recurring basis | Level 2 | Other long-term assets |  |
Assets: |  |
Interest rate swap | 1,214 | 1,710
Recurring basis | Level 3 | Other long-term liabilities |  |
Liabilities: |  |
Contingent consideration, noncurrent | $ 100,220 | $ 92,900

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