Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Operating revenues:
Electric, natural gas distribution and regulated pipeline and energy services	$ 215,472	$ 226,472	$ 621,762	$ 678,775
Nonregulated pipeline and energy services, construction materials and contracting, construction services and other	770,743	726,092	1,226,802	1,174,551
Total operating revenues	986,215	952,564	1,848,564	1,853,326
Operating expenses:
Fuel and purchased power	19,327	21,046	43,146	47,590
Purchased natural gas sold	66,589	82,252	267,739	322,329
Cost of crude oil	44,781	0	47,051	0
Operation and maintenance:
Electric, natural gas distribution and regulated pipeline and energy services	70,370	65,348	139,011	131,197
Nonregulated pipeline and energy services, construction materials and contracting, construction services and other	650,188	636,096	1,077,990	1,048,166
Depreciation, depletion and amortization	54,154	50,381	107,151	100,645
Taxes, other than income	35,478	35,087	77,478	77,437
Total operating expenses	940,887	890,210	1,759,566	1,727,364
Operating income	45,328	62,354	88,998	125,962
Other income	2,320	2,470	2,764	4,638
Interest expense	23,790	21,484	46,919	42,431
Income before income taxes	23,858	43,340	44,843	88,169
Income taxes	9,801	13,894	15,626	27,696
Income from continuing operations	14,057	29,446	29,217	60,473
Income (loss) from discontinued operations, net of tax (Note 9)	(251,415)	23,881	(576,020)	48,993
Net income (loss)	(237,358)	53,327	(546,803)	109,466
Net loss attributable to noncontrolling interest	(7,754)	(779)	(11,282)	(1,302)
Dividends declared on preferred stocks	171	171	342	342
Earnings (loss) on common stock	$ (229,775)	$ 53,935	$ (535,863)	$ 110,426
Earnings (loss) per common share - basic:
Earnings before discontinued operations	$ 0.11	$ 0.16	$ 0.21	$ 0.32
Discontinued operations, net of tax	(1.29)	0.12	(2.96)	0.26
Earnings (loss) per common share - basic	(1.18)	0.28	(2.75)	0.58
Earnings (loss) per common share - diluted:
Earnings before discontinued operations	0.11	0.16	0.21	0.32
Discontinued operations, net of tax	(1.29)	0.12	(2.96)	0.26
Earnings (loss) per common share - diluted	(1.18)	0.28	(2.75)	0.58
Dividends declared per common share	$ 0.1825	$ 0.1775	$ 0.3650	$ 0.3550
Weighted average common shares outstanding - basic	194,805	192,060	194,643	190,946
Weighted average common shares outstanding - diluted	194,838	192,659	194,675	191,543