INCOME TAXES - Reconciliation of Statutory Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Statutory income tax	$ 48,840	$ 9,365	$ 21,344
Increase (reduction) in taxes due to:
State income taxes net of federal tax benefit	16,234	3,718	7,383
Effect of regulatory treatment of fixed asset differences	(11,053)	(9,478)	(6,274)
Investment tax credits	(71)	(74)	(74)
AFUDC equity	(1,931)	(1,553)	(1,155)
Stock based stock compensation	962	677	455
TCJA refund	(11,508)	(11,618)	(13,919)
Other	1,016	2,182	(1,385)
Total income tax	$ 42,489	$ (6,781)	$ 6,375