Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Operating revenues:
Operating revenues:	$ 1,977,206	$ 1,586,013	$ 5,114,686	$ 4,237,608
Operating expenses:
Operation and maintenance:	1,546,852	1,212,898	3,771,550	3,102,353
Purchased natural gas sold	61,863	41,135	444,527	280,584
Depreciation, depletion and amortization	82,293	75,229	247,173	222,613
Taxes, other than income	56,267	48,096	185,303	163,819
Electric fuel and purchased power	20,080	19,486	68,370	56,216
Total operating expenses	1,767,355	1,396,844	4,716,923	3,825,585
Operating income	209,851	189,169	397,763	412,023
Other income (expense)	4,769	5,930	(1,877)	18,310
Interest expense	31,369	23,389	84,741	70,224
Income before income taxes	183,251	171,710	311,145	360,109
Income taxes	35,318	32,748	60,847	68,860
Income from continuing operations	147,933	138,962	250,298	291,249
Discontinued operations, net of tax	38	314	103	348
Net income	$ 147,971	$ 139,276	$ 250,401	$ 291,597
Earnings per share - basic:
Income from continuing operations	$ 0.73	$ 0.68	$ 1.23	$ 1.44
Discontinued operations, net of tax	0	0	0	0
Earnings per share - basic	0.73	0.68	1.23	1.44
Earnings per share - diluted:
Income from continuing operations	0.73	0.68	1.23	1.44
Discontinued operations, net of tax	0	0	0	0
Earnings per share - diluted	$ 0.73	$ 0.68	$ 1.23	$ 1.44
Weighted average common shares outstanding - basic	203,351	202,863	203,351	201,647
Weighted average common shares outstanding - diluted	203,644	203,190	203,407	201,955
Regulated operation
Operating revenues:
Operating revenues:	$ 263,614	$ 237,065	$ 1,140,528	$ 940,017
Operating expenses:
Operation and maintenance:	89,502	90,058	281,430	273,796
Income from continuing operations	12,917	15,399	72,761	89,207
Nonregulated operation
Operating revenues:
Operating revenues:	1,713,592	1,348,948	3,974,158	3,297,591
Operating expenses:
Operation and maintenance:	1,457,350	1,122,840	3,490,120	2,828,557
Income from continuing operations	$ 135,016	$ 123,563	$ 177,537	$ 202,042