FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Financial instruments (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Fair value disclosure
Outstanding withdrawal liability	$ 19,200
Accrued expenses
Fair value disclosure
Outstanding withdrawal liability	700
Carrying Value
Fair value disclosure
Financial instruments	231,393	$ 248,340
Fair Value | Level 2
Fair value disclosure
Financial instruments	227,119	245,369
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	162,171	178,938
Notes payable | Fair Value | Level 2
Fair value disclosure
Financial instruments	159,385	177,149
New England Pension Fund withdrawal liability | Carrying Value
Fair value disclosure
Financial instruments	19,222	19,402
New England Pension Fund withdrawal liability | Fair Value | Level 2
Fair value disclosure
Financial instruments	$ 17,734	$ 18,220
Measurement input	0.056	0.053
Financial Instrument, Measurement Input	us-gaap:MeasurementInputDiscountRateMember	us-gaap:MeasurementInputDiscountRateMember