Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating revenues:
Electric, natural gas distribution and regulated pipeline and midstream	$ 385,738	$ 406,289
Nonregulated pipeline and midstream, construction materials and contracting, construction services, refining and other revenues	519,415	456,060
Total operating revenues	905,153	862,349
Operating expenses:
Fuel and purchased power	22,011	23,819
Purchased natural gas sold	161,035	201,150
Cost of crude oil	39,800	2,270
Operation and maintenance:
Electric, natural gas distribution and regulated pipeline and midstream	74,498	68,343
Nonregulated pipeline and midstream, construction materials and contracting, construction services, refining and other	461,784	428,100
Depreciation, depletion and amortization	60,259	52,998
Taxes, other than income	44,014	42,000
Total operating expenses	863,401	818,680
Operating income	41,752	43,669
Other income	1,246	443
Interest expense	23,776	23,127
Income before income taxes	19,222	20,985
Income taxes	4,558	5,825
Income from continuing operations	14,664	15,160
Loss from discontinued operations, net of tax (Note 9)	(835)	(324,605)
Net income (loss)	13,829	(309,445)
Net loss attributable to noncontrolling interest	(11,040)	(3,528)
Dividends declared on preferred stocks	171	171
Earnings (loss) on common stock	$ 24,698	$ (306,088)
Earnings (loss) per common share - basic:
Earnings before discontinued operations	$ 0.13	$ 0.10
Discontinued operations, net of tax	0.00	(1.67)
Earnings (loss) per common share - basic	0.13	(1.57)
Earnings (loss) per common share - diluted:
Earnings before discontinued operations	0.13	0.10
Discontinued operations, net of tax	0.00	(1.67)
Earnings (loss) per common share - diluted	0.13	(1.57)
Dividends declared per common share	$ 0.1875	$ 0.1825
Weighted average common shares outstanding - basic	195,284	194,479
Weighted average common shares outstanding - diluted	195,284	194,566