REVENUE (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Regulated Operating Revenue, Gas	$ 2,346,321	$ 2,561,618	$ 1,787,815
Regulated Operating Revenue, Other	25,669	16,387	20,782
Regulated Operating Revenue	2,371,990	2,578,005	1,808,597
Unbilled Receivables, Current	191,400	269,500
Natural gas sales to customers [Member]
Regulated Operating Revenue, Gas	2,141,908	2,410,048	1,652,566
Transportation revenues [Member]
Regulated Operating Revenue, Gas	132,945	125,951	118,492
Securitization Customer Charges
Regulated Operating Revenue, Gas	48,677	5,769	0
Miscellaneous revenues [Member]
Regulated Operating Revenue, Gas	22,791	19,850	16,757
Other revenues - natural gas sales related [Member]
Regulated Operating Revenue, Other	12,764	3,403	9,650
Other revenues [Member]
Regulated Operating Revenue, Other	$ 12,905	$ 12,984	$ 11,132