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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Assets and Liabilities (Details) - Recurring basis $ in Thousands | Sep. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
--- | --- | ---
Assets: |  |
Assets | $ 97,372 | $ 19,240
Liabilities: |  |
Liabilities | 99,200 | 112,000
Cash and cash equivalents |  |
Assets: |  |
Money market funds | 90,832 | 11,732
Other long-term assets |  |
Assets: |  |
Equity, bond, and money market mutual funds held in trust related to the Voluntary Savings Plan | 4,072 | 3,982
Interest rate swap | 2,468 | 3,526
Other long-term liabilities |  |
Liabilities: |  |
Contingent consideration | 99,200 | 112,000
Level 1 |  |
Assets: |  |
Assets | 94,904 | 15,714
Level 1 | Cash and cash equivalents |  |
Assets: |  |
Money market funds | 90,832 | 11,732
Level 1 | Other long-term assets |  |
Assets: |  |
Equity, bond, and money market mutual funds held in trust related to the Voluntary Savings Plan | 4,072 | 3,982
Level 2 |  |
Assets: |  |
Assets | 2,468 | 3,526
Level 2 | Other long-term assets |  |
Assets: |  |
Interest rate swap | 2,468 | 3,526
Level 3 |  |
Liabilities: |  |
Liabilities | $ 99,200 | $ 112,000
Level 3 | Contingent consideration |  |
Liabilities: |  |
Measurement input | 0.145 | 0.140
Business Combination, Contingent Consideration, Liability, Valuation Technique | us-gaap:ValuationTechniqueDiscountedCashFlowMember | us-gaap:ValuationTechniqueDiscountedCashFlowMember
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Level 3 | Other long-term liabilities |  |
Liabilities: |  |
Contingent consideration | $ 99,200 | $ 112,000

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