Condensed Consolidated Statements of Income (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenues
Revenues	$ 897,158	$ 928,237
Expenses
Total expenses	820,739	834,719
Operating income (loss)
Total operating income	76,419	93,518
Retirement defined benefits credit—other than service costs	1,282	1,152
Interest expense, net—other than on deposit liabilities and other bank borrowings	(31,591)	(28,798)
Allowance for borrowed funds used during construction	1,386	1,131
Allowance for equity funds used during construction	3,640	3,301
Interest income	3,133	0
Income before income taxes	54,269	70,304
Income taxes	11,674	15,110
Net income (loss)	42,595	55,194
Preferred stock dividends of subsidiaries	473	473
Net income for common stock	$ 42,122	$ 54,721
Basic earnings per common share (in dollars per share)	$ 0.38	$ 0.50
Diluted earnings per common share (in dollars per share)	$ 0.38	$ 0.50
Weighted-average number of common shares outstanding (in shares)	110,218	109,514
Net effect of potentially dilutive shares (share-based compensation programs) (in shares)	258	311
Weighted-average shares assuming dilution (in shares)	110,476	109,825
Electric utility
Revenues
Revenues	$ 788,578	$ 830,361
Expenses
Total expenses	725,223	754,486
Operating income (loss)
Total operating income	63,355	75,875
Income before income taxes	50,900	61,108
Income taxes	11,180	13,600
Net income (loss)	39,720	47,508
Preferred stock dividends of subsidiaries	499	499
Net income for common stock	39,221	47,009
Bank
Revenues
Revenues	105,144	93,857
Expenses
Total expenses	79,612	70,337
Operating income (loss)
Total operating income	25,532	23,520
Income before income taxes	25,813	23,707
Income taxes	4,879	5,145
Net income (loss)	20,934	18,562
Preferred stock dividends of subsidiaries	0	0
Net income for common stock	20,934	18,562
Other
Revenues
Revenues	3,436	4,019
Expenses
Total expenses	15,904	9,896
Operating income (loss)
Total operating income	(12,468)	(5,877)
Income before income taxes	(22,444)	(14,511)
Income taxes	(4,385)	(3,635)
Net income (loss)	(18,059)	(10,876)
Preferred stock dividends of subsidiaries	(26)	(26)
Net income for common stock	$ (18,033)	$ (10,850)