Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Revenues
Regulated Energy		$ 583,400	$ 473,600	$ 429,400
Unregulated Energy		228,400	223,100	280,800
Other		(24,600)	(26,100)	(29,500)
Total operating revenues		787,200	670,600	680,700
Operating Expenses
Natural gas and electricity costs		144,200	140,000	127,200
Propane and natural gas costs		75,600	76,500	133,300
Operations		210,100	178,400	164,500
Maintenance		22,500	20,400	18,200
Depreciation and amortization		65,700	65,500	69,000
Other taxes		36,900	28,600	25,600
Total operating expenses		559,000	519,800	537,800
Operating Income		228,200	150,800	142,900
Other income, net		2,000	1,400	5,100
Interest charges		68,400	36,900	24,400
Income Before Income Taxes		161,800	115,300	123,600
Income taxes		43,200	28,100	33,800
Net Income (Loss) Attributable to Parent		$ 118,600	$ 87,200	$ 89,800
Weighted Average Common Shares Outstanding:
Basic (in shares)	[1]	22,469	18,371	17,722
Diluted (in shares)	[1]	22,531	18,435	17,804
Earnings Per Share of Common Stock:
Income (Loss) from Continuing Operations, Per Basic Share		$ 5.28	$ 4.75	$ 5.07
Basic (in usd per share)		5.28	4.75	5.07
Earnings Per Share, Diluted [Abstract]
Income (Loss) from Continuing Operations, Per Diluted Share		5.26	4.73	5.04
Diluted (in usd per share)		$ 5.26	$ 4.73	$ 5.04
Transaction-related expenses		$ 4,000	$ 10,400	$ 0

[1] ) 2023 and 2024 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 15 for additional details on the acquisition and related equity offering.