Condensed Consolidated Statements of Income (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Revenues
Revenues	$ 746,447	$ 744,070
Expenses
Total expenses	693,070	681,650
Operating income (loss)
Operating income (loss)	53,377	62,420
Retirement defined benefits credit—other than service costs	879	917
Interest expense, net	(31,128)	(34,212)
Allowance for borrowed funds used during construction	1,705	1,417
Allowance for equity funds used during construction	3,764	3,585
Interest and dividend income	9,995	12,623
Loss on sale of a subsidiary	0	(13,211)
Income before income taxes	38,592	33,539
Income tax expense	8,142	6,395
Net income	30,450	27,144
Preferred stock dividends of subsidiaries	0	473
Net income for common stock	$ 30,450	$ 26,671
Basic earnings per common share (in dollars per share)	$ 0.18	$ 0.15
Diluted earnings per common share (in dollars per share)	$ 0.18	$ 0.15
Weighted-average number of common shares outstanding:
Weighted-average number of common shares outstanding (in shares)	172,626	172,478
Net effect of potentially dilutive shares (share-based compensation programs) (in shares)	700	334
Weighted-average shares assuming dilution (in shares)	173,326	172,812
Electric utility
Revenues
Revenues	$ 744,040	$ 738,366
Expenses
Total expenses	681,507	662,429
Operating income (loss)
Operating income (loss)	62,533	75,937
Other
Revenues
Revenues	2,407	5,704
Expenses
Total expenses	11,563	19,221
Operating income (loss)
Operating income (loss)	$ (9,156)	$ (13,517)