Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Operating Revenues
Regulated Energy		$ 687,800	$ 583,400	$ 473,600
Unregulated Energy		271,900	228,400	223,100
Other		(29,700)	(24,600)	(26,100)
Total operating revenues		930,000	787,200	670,600
Operating Expenses
Natural gas and electricity costs		193,800	144,200	140,000
Propane and natural gas costs		97,700	75,600	76,500
Operations		229,300	210,100	178,400
Maintenance		23,900	22,500	20,400
Depreciation and amortization		91,700	65,700	65,500
Other taxes		36,500	36,900	28,600
Total operating expenses		674,100	559,000	519,800
Operating Income		255,900	228,200	150,800
Other income, net		9,600	2,000	1,400
Interest charges		72,500	68,400	36,900
Income Before Income Taxes		193,000	161,800	115,300
Income taxes		52,700	43,200	28,100
Net Income (Loss) Attributable to Parent		$ 140,300	$ 118,600	$ 87,200
Weighted Average Common Shares Outstanding:
Basic (in shares)	[1]	23,389	22,469	18,371
Diluted (in shares)	[1]	23,488	22,531	18,435
Earnings Per Share of Common Stock:
Income (Loss) from Continuing Operations, Per Basic Share		$ 6.00	$ 5.28	$ 4.75
Basic (in usd per share)		6.00	5.28	4.75
Earnings Per Share, Diluted [Abstract]
Income (Loss) from Continuing Operations, Per Diluted Share		5.97	5.26	4.73
Diluted (in usd per share)		$ 5.97	$ 5.26	$ 4.73
Transaction-related expenses		$ 1,200	$ 4,000	$ 10,400

[1] ) Weighted average shares reflect the impact of 4.4 million common shares issued in November 2023 in connection with the acquisition of FCG. See Notes 4 and 14 for additional details on the acquisition and related equity offering.