Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating Revenues
Regulated Energy	$ 121,197	$ 102,955
Unregulated Energy and other	69,990	49,735
Total Operating Revenues	191,187	152,690
Operating Expenses
Regulated Energy cost of sales	43,043	34,832
Unregulated Energy and other cost of sales	31,254	18,038
Operations	39,437	35,951
Maintenance	4,042	3,836
Depreciation and amortization	15,365	12,252
Other taxes	6,449	5,647
Total Operating Expenses	139,590	110,556
Total operating income	51,597	42,134
Other income, net	385	3,319
Interest charges	5,105	5,814
Income from Continuing Operations Before Income Taxes	46,877	39,639
Income Taxes on Continuing Operations	12,405	10,598
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	34,472	29,041
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax	(6)	(111)
Net Income	$ 34,466	$ 28,930
Weighted Average Common Shares Outstanding:
Basic (shares)	17,485,866	16,414,773
Diluted (shares)	17,553,167	16,471,827
Basic Earnings Per Share of Common Stock:
Income (Loss) from Continuing Operations, Per Basic Share	$ 1.97	$ 1.77
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share	0	(0.01)
Basic (in dollars per share)	1.97	1.76
Earnings Per Share, Diluted [Abstract]
Income (Loss) from Continuing Operations, Per Diluted Share	1.96	1.77
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share	0	(0.01)
Diluted (in dollars per share)	$ 1.96	$ 1.76