CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Utility revenues:
Utility revenues, exclusive of alternative revenue programs	$ 374,285	$ 384,214	$ 867,828	$ 862,917
Alternative revenue programs	5,513	(5,793)	(13,525)	(22,570)
Total utility revenues	379,798	378,421	854,303	840,347
Non-utility revenues	139	145	265	265
Total operating revenues	379,937	378,566	854,568	840,612
Utility operating expenses:
Resource costs	141,244	157,397	334,172	344,265
Other operating expenses	103,071	104,482	208,049	199,009
Depreciation and amortization	66,148	62,806	131,336	125,383
Taxes other than income taxes	24,917	26,658	58,811	60,775
Non-utility operating expenses	749	2,940	1,791	3,928
Total operating expenses	336,129	354,283	734,159	733,360
Income from operations	43,808	24,283	120,409	107,252
Capitalized interest	(866)	(932)	(1,708)	(2,025)
Other income-net	(2,626)	(13,934)	(9,055)	(18,785)
Income before income taxes	11,674	10,454	59,891	71,183
Income tax benefit	(5,810)	(999)	(12,438)	(11,835)
Net income	$ 17,484	$ 11,453	$ 72,329	$ 83,018
Weighted-average common shares outstanding (thousands), basic	75,983	72,624	75,576	72,205
Weighted-average common shares outstanding (thousands), diluted	76,131	72,658	75,703	72,294
Earnings per common share:
Basic	$ 0.23	$ 0.16	$ 0.96	$ 1.15
Diluted	$ 0.23	$ 0.16	$ 0.96	$ 1.15
Non Affiliated Trusts [Member]
Utility operating expenses:
Interest expense	$ 35,018	$ 28,518	$ 70,102	$ 56,585
Affiliated Trusts [Member]
Utility operating expenses:
Interest expense	$ 608	$ 177	$ 1,179	$ 294