FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Debt (Details) $ in Thousands	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Fair value disclosure
Outstanding withdrawal liability	$ 20,600
Accrued expenses
Fair value disclosure
Outstanding withdrawal liability	700
Other long-term liabilities
Fair value disclosure
Outstanding withdrawal liability	19,900
Carrying value
Fair value disclosure
Financial instruments	279,282	$ 246,299
Fair value disclosure
Fair value disclosure
Financial instruments	279,290	249,458
Credit Facility | Carrying value | Level 2
Fair value disclosure
Financial instruments	88,000	50,000
Credit Facility | Fair value disclosure | Level 2
Fair value disclosure
Financial instruments	88,000	50,000
Notes payable | Carrying value | Level 2
Fair value disclosure
Financial instruments	170,678	175,530
Notes payable | Fair value disclosure | Level 2
Fair value disclosure
Financial instruments	$ 169,268	$ 175,937
New England Pension Fund withdrawal liability | Discount Rate
Fair value disclosure
Measurement input	0.037	0.031
New England Pension Fund withdrawal liability | Carrying value | Level 2
Fair value disclosure
Financial instruments	$ 20,604	$ 20,769
New England Pension Fund withdrawal liability | Fair value disclosure | Level 2
Fair value disclosure
Financial instruments	$ 22,022	$ 23,521