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
Business Combination, Contingent Consideration, Liability, Measurement Input	us-gaap:MeasurementInputDiscountRateMember	us-gaap:MeasurementInputDiscountRateMember
Level 3 | Other long-term liabilities
Liabilities:
Contingent consideration	$ 99,200	$ 112,000