FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Financial instruments (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Carrying Value
Fair value disclosure
Financial instruments	$ 248,340	$ 284,723
Fair Value | Level 2
Fair value disclosure
Financial instruments	245,369	276,689
Credit Facility | Carrying Value
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
Fair value disclosure
Financial instruments	178,938	214,623
Notes payable | Fair Value | Level 2
Fair value disclosure
Financial instruments	177,149	207,778
New England Pension Fund withdrawal liability
Fair value disclosure
Outstanding withdrawal liability	19,400
New England Pension Fund withdrawal liability | Accrued expenses
Fair value disclosure
Outstanding withdrawal liability	700
New England Pension Fund withdrawal liability | Carrying Value
Fair value disclosure
Financial instruments	19,402	20,100
New England Pension Fund withdrawal liability | Fair Value | Level 2
Fair value disclosure
Financial instruments	$ 18,220	$ 18,911
Measurement input	0.053	0.053
Financial Instrument, Measurement Input	Discount Rate	Discount Rate