FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Assets and Liabilities (Details) - Recurring basis - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Assets:
Assets	$ 61,400	$ 8,322
Liabilities:
Liabilities	94,510	94,155
Cash and cash equivalents
Assets:
Money market funds	54,840	3,600
Other long-term assets
Assets:
Equity, bond, and money market mutual funds held in trust related to the Voluntary Savings Plan	3,701	3,848
Interest rate swaps	2,859	874
Other long-term liabilities
Liabilities:
Interest rate swap		455
Contingent consideration	94,510	93,700
Level 1
Assets:
Assets	58,541	7,448
Level 1 | Cash and cash equivalents
Assets:
Money market funds	54,840	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	3,701	3,848
Level 2
Assets:
Assets	2,859	874
Liabilities:
Liabilities		455
Level 2 | Other long-term assets
Assets:
Interest rate swaps	2,859	874
Level 2 | Other long-term liabilities
Liabilities:
Interest rate swap		455
Level 3
Liabilities:
Liabilities	94,510	93,700
Level 3 | Other long-term liabilities
Liabilities:
Contingent consideration	$ 94,510	$ 93,700