Business segment data (Tables)

6 Months Ended

Jun. 30, 2017

Segment Reporting [Abstract]

Information on the Company's businesses

Information on the Company's businesses was as follows:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2017			2016			2017			2016
	(In thousands)
External operating revenues:
Regulated operations:
Electric	$	74,574		$	73,832		$	162,799		$	156,755
Natural gas distribution	131,592			112,770			474,111			412,165
Pipeline and midstream	19,319			19,450			22,190			22,998
	225,485			206,052			659,100			591,918
Nonregulated operations:
Pipeline and midstream	4,520			10,268			8,163			18,966
Construction materials and contracting	501,426			541,257			702,203			751,108
Construction services	336,009			285,924			635,580			541,424
Other	199			447			519			747
	842,154			837,896			1,346,465			1,312,245
Total external operating revenues	$	1,067,639		$	1,043,948		$	2,005,565		$	1,904,163
Intersegment operating revenues:
Regulated operations:
Electric	$	—		$	—		$	—		$	—
Natural gas distribution	—			—			—			—
Pipeline and midstream	6,353			6,594			27,841			27,691
	6,353			6,594			27,841			27,691
Nonregulated operations:
Pipeline and midstream	59			36			93			119
Construction materials and contracting	172			97			258			215
Construction services	295			77			301			539
Other	1,758			1,669			3,501			3,338
	2,284			1,879			4,153			4,211
Intersegment eliminations	(8,637		)	(8,473		)	(31,994		)	(31,902		)
Total intersegment operating revenues	$	—		$	—		$	—		$	—

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2017			2016			2017			2016
	(In thousands)
Earnings (loss) on common stock:
Regulated operations:
Electric	$	7,859		$	8,022		$	22,191		$	19,141
Natural gas distribution	(2,797		)	(7,777		)	25,064			17,464
Pipeline and midstream	5,492			5,564			10,048			10,852
	10,554			5,809			57,303			47,457
Nonregulated operations:
Pipeline and midstream	(238		)	737			(865		)	739
Construction materials and contracting	21,168			33,696			1,255			19,225
Construction services	12,391			6,990			19,753			12,964
Other	(2,163		)	(1,105		)	(2,440		)	(2,564		)
	31,158			40,318			17,703			30,364
Intersegment eliminations*	2,093			—			4,266			—
Earnings on common stock before loss from discontinued operations	43,805			46,127			79,272			77,821
Loss from discontinued operations, net of tax*	(3,190		)	(276,102		)	(1,504		)	(294,138		)
Loss from discontinued operations attributable to noncontrolling interest	—			(120,651		)	—			(131,691		)
Total earnings (loss) on common stock	$	40,615		$	(109,324	)	$	77,768		$	(84,626	)

* Includes eliminations for the presentation of income tax adjustments between continuing and discontinued operations.