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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Financial instruments (Details) $ in Thousands	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Fair value disclosure
Outstanding withdrawal liability	$ 19,600
Accrued expenses
Fair value disclosure
Outstanding withdrawal liability	700
Carrying Value
Fair value disclosure
Financial instruments	262,737	$ 284,723
Fair Value
Fair value disclosure
Financial instruments	256,249	276,689
Credit Facility | Carrying Value | Level 2
Fair value disclosure
Financial instruments	50,000	50,000
Credit Facility | Fair Value | Level 2
Fair value disclosure
Financial instruments	50,000	50,000
Notes payable | Carrying Value | Level 2
Fair value disclosure
Financial instruments	193,158	214,623
Notes payable | Fair Value | Level 2
Fair value disclosure
Financial instruments	188,841	207,778
New England Pension Fund withdrawal liability | Carrying Value | Level 2
Fair value disclosure
Financial instruments	19,579	20,100
New England Pension Fund withdrawal liability | Fair Value | Level 2
Fair value disclosure
Financial instruments	$ 17,408	$ 18,911
Measurement input	0.061	0.053
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