REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Regulated Operating Revenue, Gas	$ 426,420	$ 311,739	$ 1,392,389	$ 935,390
Regulated Operating Revenue, Other	2,555	3,907	8,045	5,549
Regulated Operating Revenue	428,975	315,646	1,400,434	940,939
Unbilled Receivables, Current	71,900		71,900		$ 183,200
Natural gas sales to customers [Member]
Regulated Operating Revenue, Gas	393,292	281,450	1,318,449	865,244
Transportation revenues [Member]
Regulated Operating Revenue, Gas	28,000	26,216	64,316	62,418
Miscellaneous revenues [Member]
Regulated Operating Revenue, Gas	5,128	4,073	9,624	7,728
Other revenues - natural gas sales related [Member]
Regulated Operating Revenue, Other	(115)	1,325	2,231	304
Other revenues [Member]
Regulated Operating Revenue, Other	$ 2,670	$ 2,582	$ 5,814	$ 5,245