FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Financial instruments (Details) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)
Fair value disclosure
Outstanding withdrawal liability	$ 18,300
Accrued expenses
Fair value disclosure
Outstanding withdrawal liability	800
Carrying Value
Fair value disclosure
Financial instruments	259,692	$ 207,805
Fair Value \| Level 2
Fair value disclosure
Financial instruments	259,065	204,458
Credit Facility \| Carrying Value
Fair value disclosure
Financial instruments	25,000
Credit Facility \| Fair Value \| Level 2
Fair value disclosure
Financial instruments	25,000
Notes payable \| Carrying Value
Fair value disclosure
Financial instruments	216,399	189,134
Notes payable \| Fair Value \| Level 2
Fair value disclosure
Financial instruments	217,499	187,675
New England Pension Fund withdrawal liability \| Carrying Value
Fair value disclosure
Financial instruments	18,293	18,671
New England Pension Fund withdrawal liability \| Fair Value \| Level 2
Fair value disclosure
Financial instruments	$ 16,566	$ 16,783
Measurement input	0.059	0.06
Financial Instrument, Measurement Input	us-gaap:MeasurementInputDiscountRateMember	us-gaap:MeasurementInputDiscountRateMember

Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-28

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-10

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E

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Balance Type:	credit
Period Type:	instant