BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES - Impact of Adoption (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total revenues	$ 879,654	$ 829,424	$ 734,159
Electricity | Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total revenues	553,348	542,065	529,264
Energy storage
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total revenues	37,729	28,894	31,018
Energy storage | Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total revenues	$ 326,306	$ 287,359	$ 204,895