Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating revenues:
Operating revenues:	$ 1,416,559	$ 1,227,938
Operating expenses:
Operation and maintenance:	907,897	811,659
Purchased natural gas sold	267,353	176,237
Depreciation, depletion and amortization	80,121	73,723
Taxes, other than income	67,484	62,534
Electric fuel and purchased power	26,361	18,621
Total operating expenses	1,349,216	1,142,774
Operating income	67,343	85,164
Other income (expense)	(2,400)	3,354
Interest expense	25,260	23,453
Income before income taxes	39,683	65,065
Income taxes	7,950	12,949
Income from continuing operations	31,733	52,116
Income from discontinued operations, net of tax	30	15
Net income	$ 31,763	$ 52,131
Earnings per share - basic:
Income from continuing operations	$ 0.16	$ 0.26
Discontinued operations, net of tax	0	0
Earnings per share - basic	0.16	0.26
Earnings per share - diluted:
Income from continuing operations	0.16	0.26
Discontinued operations, net of tax	0	0
Earnings per share - diluted	$ 0.16	$ 0.26
Weighted average common shares outstanding - basic	203,351	200,708
Weighted average common shares outstanding - diluted	203,391	200,952
Regulated operation
Operating revenues:
Operating revenues:	$ 553,456	$ 442,381
Operating expenses:
Operation and maintenance:	97,665	94,333
Income from continuing operations	55,549	56,121
Nonregulated operation
Operating revenues:
Operating revenues:	863,103	785,557
Operating expenses:
Operation and maintenance:	810,232	717,326
Income from continuing operations	$ (23,816)	$ (4,005)