CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Utility revenues:
Utility revenues, exclusive of alternative revenue programs	$ 385,861	$ 374,285	$ 992,372	$ 867,828
Alternative revenue programs	16,171	5,513	19,054	(13,525)
Total utility revenues	402,032	379,798	1,011,426	854,303
Non-utility revenues	40	139	62	265
Total operating revenues	402,072	379,937	1,011,488	854,568
Utility operating expenses:
Resource costs	144,326	141,244	437,443	334,172
Other operating expenses	109,591	103,071	220,840	208,049
Depreciation and amortization	67,829	66,148	135,756	131,336
Taxes other than income taxes	25,710	24,917	61,398	58,811
Non-utility operating expenses	360	749	679	1,791
Total operating expenses	347,816	336,129	856,116	734,159
Income from operations	54,256	43,808	155,372	120,409
Interest expense	35,924	35,018	72,828	70,102
Interest expense to affiliated trust	656	608	1,313	1,179
Capitalized interest	(1,145)	(866)	(2,106)	(1,708)
Other income-net	(4,532)	(2,626)	(13,817)	(9,055)
Income before income taxes	23,353	11,674	97,154	59,891
Income tax expense (benefit)	495	(5,810)	2,801	(12,438)
Net income	$ 22,858	$ 17,484	$ 94,353	$ 72,329
Weighted-average common shares outstanding (thousands), basic	78,390	75,983	78,276	75,576
Weighted-average common shares outstanding (thousands), diluted	78,456	76,131	78,333	75,703
Earnings per common share:
Basic	$ 0.29	$ 0.23	$ 1.2	$ 0.96
Diluted	$ 0.29	$ 0.23	$ 1.2	$ 0.96