Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Operating revenues:
Operating revenues:	$ 1,720,921	$ 1,423,657	$ 3,137,480	$ 2,651,595
Operating expenses:
Operation and maintenance:	1,316,801	1,077,796	2,224,698	1,889,454
Purchased natural gas sold	115,312	63,213	382,665	239,450
Depreciation, depletion and amortization	84,758	73,661	164,880	147,384
Taxes, other than income	61,551	53,189	129,035	115,724
Electric fuel and purchased power	21,929	18,109	48,290	36,730
Total operating expenses	1,600,351	1,285,968	2,949,568	2,428,742
Operating income	120,570	137,689	187,912	222,853
Other income (expense)	(4,246)	9,027	(6,646)	12,381
Interest expense	28,113	23,381	53,373	46,835
Income before income taxes	88,211	123,335	127,893	188,399
Income taxes	17,579	23,164	25,528	36,112
Income from continuing operations	70,632	100,171	102,365	152,287
Discontinued operations, net of tax	35	19	65	34
Net income	$ 70,667	$ 100,190	$ 102,430	$ 152,321
Earnings per share - basic:
Income from continuing operations	$ 0.35	$ 0.50	$ 0.50	$ 0.76
Discontinued operations, net of tax	0	0	0	0
Earnings per share - basic	0.35	0.50	0.50	0.76
Earnings per share - diluted:
Income from continuing operations	0.35	0.50	0.50	0.76
Discontinued operations, net of tax	0	0	0	0
Earnings per share - diluted	$ 0.35	$ 0.50	$ 0.50	$ 0.76
Weighted average common shares outstanding - basic	203,351	201,345	203,351	201,028
Weighted average common shares outstanding - diluted	203,401	201,693	203,396	201,328
Regulated operation
Operating revenues:
Operating revenues:	$ 323,457	$ 260,568	$ 876,913	$ 702,951
Operating expenses:
Operation and maintenance:	94,261	89,404	191,928	183,737
Income from continuing operations	4,294	17,686	59,844	73,808
Nonregulated operation
Operating revenues:
Operating revenues:	1,397,464	1,163,089	2,260,567	1,948,644
Operating expenses:
Operation and maintenance:	1,222,540	988,392	2,032,770	1,705,717
Income from continuing operations	$ 66,338	$ 82,485	$ 42,521	$ 78,479