Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating revenues:
Operating revenues:	$ 1,197,373	$ 1,091,191
Operating expenses:
Operation and maintenance:	821,000	702,914
Purchased natural gas sold	165,412	183,829
Depreciation, depletion and amortization	69,239	59,897
Taxes, other than income	64,112	54,029
Electric fuel and purchased power	20,540	26,304
Total operating expenses	1,140,303	1,026,973
Operating income	57,070	64,218
Other income (expense)	(1,005)	7,595
Interest expense	24,553	23,407
Income before income taxes	31,512	48,406
Income taxes	5,973	7,317
Income from continuing operations	25,539	41,089
Loss from discontinued operations, net of tax	(409)	(163)
Net income	$ 25,130	$ 40,926
Earnings per share - basic:
Income from continuing operations	$ 0.13	$ 0.21
Discontinued operations, net of tax	0	0
Earnings per share - basic	0.13	0.21
Earnings per share - diluted:
Income from continuing operations	0.13	0.21
Discontinued operations, net of tax	0	0
Earnings per share - diluted	$ 0.13	$ 0.21
Weighted average common shares outstanding - basic	200,440	196,401
Weighted average common shares outstanding - diluted	200,456	196,414
Regulated operation
Operating revenues:
Operating revenues:	$ 418,682	$ 439,617
Operating expenses:
Operation and maintenance:	87,608	87,770
Income from continuing operations	51,129	59,009
Nonregulated operation
Operating revenues:
Operating revenues:	778,691	651,574
Operating expenses:
Operation and maintenance:	733,392	615,144
Income from continuing operations	$ (25,590)	$ (17,920)