CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Utility revenues:
Utility revenues, exclusive of alternative revenue programs	$ 493,543	$ 478,703
Alternative revenue programs	(19,038)	(16,777)
Total utility revenues	474,505	461,926
Non-utility revenues	126	120
Total operating revenues	474,631	462,046
Utility operating expenses:
Resource costs	192,928	186,868
Other operating expenses	104,978	94,527
Depreciation and amortization	65,188	62,577
Taxes other than income taxes	33,894	34,117
Non-utility operating expenses:
Other operating expenses	1,011	956
Depreciation and amortization	31	32
Total operating expenses	398,030	379,077
Income from operations	76,601	82,969
Interest expense	35,084	28,067
Interest expense to affiliated trusts	571	117
Capitalized interest	(842)	(1,093)
Other income-net	(6,429)	(4,851)
Income before income taxes	48,217	60,729
Income tax benefit	(6,628)	(10,836)
Net income	$ 54,845	$ 71,565
Weighted-average common shares outstanding (thousands), basic	75,169	71,787
Weighted-average common shares outstanding (thousands), diluted	75,275	71,930
Earnings per common share:
Basic	$ 0.73	$ 1.00
Diluted	$ 0.73	$ 0.99