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DEBT - Narrative - Tax-Exempt Financings (Details) - Unsecured Debt - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Principal amount of debt	$ 273,500
Vermont Bonds 2022A-1
Debt Instrument [Line Items]
Principal amount of debt	25,000	$ 0
Aggregate principal amount issued	$ 25,000
Stated interest rate	4.375%
FAME Bonds 2015R-3
Debt Instrument [Line Items]
Principal amount of debt	$ 29,000	0
Aggregate principal amount issued	$ 29,000
Stated interest rate	5.00%
New York Bonds 2020
Debt Instrument [Line Items]
Principal amount of debt	$ 37,500	40,000
Aggregate principal amount issued	$ 37,500
Stated interest rate	4.25%
FAME Bonds 2024
Debt Instrument [Line Items]
Principal amount of debt	$ 45,000	45,000
Aggregate principal amount issued		$ 45,000
Stated interest rate	4.625%	4.625%
FAME Bonds 2024, Restricted
Debt Instrument [Line Items]
Aggregate principal amount issued		$ 25,000

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