Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Operating revenues:
Operating revenues:	$ 1,303,573	$ 1,064,597	$ 2,394,764	$ 2,040,890
Operating expenses:
Operation and maintenance:	1,021,031	822,084	1,723,945	1,422,940
Purchased natural gas sold	54,866	56,228	238,695	238,196
Depreciation, depletion and amortization	63,019	53,553	122,916	106,282
Taxes, other than income	47,953	40,757	101,982	89,610
Electric fuel and purchased power	19,393	17,983	45,696	40,494
Total operating expenses	1,206,262	990,605	2,233,234	1,897,522
Operating income	97,311	73,992	161,530	143,368
Other income	1,615	1,599	9,208	2,181
Interest expense	25,429	20,800	48,836	41,246
Income before income taxes	73,497	54,791	121,902	104,303
Income taxes	10,352	10,716	17,668	18,267
Income from continuing operations	63,145	44,075	104,234	86,036
Income (loss) from discontinued operations, net of tax (Note 10)	(1,320)	(273)	(1,483)	203
Net income	$ 61,825	$ 43,802	$ 102,751	$ 86,239
Earnings per share - basic:
Income from continuing operations	$ 0.32	$ 0.22	$ 0.53	$ 0.44
Discontinued operations, net of tax	(0.01)	0	(0.01)	0
Earnings per share - basic	0.31	0.22	0.52	0.44
Earnings per share - diluted:
Income from continuing operations	0.32	0.22	0.53	0.44
Discontinued operations, net of tax	(0.01)	0	(0.01)	0
Earnings per share - diluted	$ 0.31	$ 0.22	$ 0.52	$ 0.44
Weighted average common shares outstanding - basic	198,270	195,524	197,341	195,415
Weighted average common shares outstanding - diluted	198,287	196,169	197,356	196,077
Regulated operation
Operating revenues:
Operating revenues:	$ 236,247	$ 226,684	$ 675,864	$ 651,143
Operating expenses:
Operation and maintenance:	88,415	83,928	176,186	170,042
Income from continuing operations	7,597	7,521	66,606	58,686
Nonregulated operation
Operating revenues:
Operating revenues:	1,067,326	837,913	1,718,900	1,389,747
Operating expenses:
Operation and maintenance:	932,616	738,156	1,547,759	1,252,898
Income from continuing operations	$ 55,548	$ 36,554	$ 37,628	$ 27,350