Revenue from contracts with customers (Tables)

3 Months Ended

Mar. 31, 2020

Revenue from Contract with Customer [Abstract]

Disaggregation of revenue

In the following table, revenue is disaggregated by the type of customer or service provided. The Company believes this level of disaggregation best depicts how the nature, amount, timing and uncertainty of revenue and cash flows are affected by economic factors. The table also includes a reconciliation of the disaggregated revenue by reportable segments. For more information on the Company's business segments, see Note 16.

Three Months Ended March 31, 2020	Electric			Natural gas distribution			Pipeline			Construction materials and contracting			Construction services			Other			Total
	(In thousands)
Residential utility sales	$	32,349		$	186,701		$	—		$	—		$	—		$	—		$	219,050
Commercial utility sales	33,587			114,996			—			—			—			—			148,583
Industrial utility sales	10,367			8,521			—			—			—			—			18,888
Other utility sales	1,648			—			—			—			—			—			1,648
Natural gas transportation	—			11,798			27,432			—			—			—			39,230
Natural gas gathering	—			—			2,090			—			—			—			2,090
Natural gas storage	—			—			3,046			—			—			—			3,046
Contracting services	—			—			—			98,401			—			—			98,401
Construction materials	—			—			—			207,910			—			—			207,910
Intrasegment eliminations*	—			—			—			(44,104		)	—			—			(44,104		)
Inside specialty contracting	—			—			—			—			372,209			—			372,209
Outside specialty contracting	—			—			—			—			130,150			—			130,150
Other	8,450			2,498			3,241			—			351			2,991			17,531
Intersegment eliminations	(195		)	(185		)	(25,199		)	(63		)	(2,470		)	(2,973		)	(31,085		)
Revenues from contracts with customers	86,206			324,329			10,610			262,144			500,240			18			1,183,547
Revenues out of scope	(298		)	2,114			45			—			11,965			—			13,826
Total external operating revenues	$	85,908		$	326,443		$	10,655		$	262,144		$	512,205		$	18		$	1,197,373

* Intrasegment revenues are presented within the construction materials and contracting segment to highlight the focus on vertical integration as this segment sells materials to both third parties and internal customers. Due to consolidation requirements, these revenues must be eliminated against construction materials to arrive at the external operating revenue total for the segment.

Three Months Ended March 31, 2019	Electric		Natural gas distribution			Pipeline			Construction materials and contracting			Construction services			Other			Total
	(In thousands)
Residential utility sales	$	36,555	$	200,609		$	—		$	—		$	—		$	—		$	237,164
Commercial utility sales	35,671		121,793			—			—			—			—			157,464
Industrial utility sales	8,884		8,611			—			—			—			—			17,495
Other utility sales	1,799		—			—			—			—			—			1,799
Natural gas transportation	—		11,570			25,058			—			—			—			36,628
Natural gas gathering	—		—			2,121			—			—			—			2,121
Natural gas storage	—		—			2,646			—			—			—			2,646
Contracting services	—		—			—			83,039			—			—			83,039
Construction materials	—		—			—			179,309			—			—			179,309
Intrasegment eliminations*	—		—			—			(35,140		)	—			—			(35,140		)
Inside specialty contracting	—		—			—			—			299,530			—			299,530
Outside specialty contracting	—		—			—			—			107,398			—			107,398
Other	9,121		3,913			2,696			—			17			7,843			23,590
Intersegment eliminations	—		—			(23,955		)	(95		)	(129		)	(7,824		)	(32,003		)
Revenues from contracts with customers	92,030		346,496			8,566			227,113			406,816			19			1,081,040
Revenues out of scope	536		(4,349		)	47			—			13,917			—			10,151
Total external operating revenues	$	92,566	$	342,147		$	8,613		$	227,113		$	420,733		$	19		$	1,091,191

* Intrasegment revenues are presented within the construction materials and contracting segment to highlight the focus on vertical integration as this segment sells materials to both third parties and internal customers. Due to consolidation requirements, these revenues must be eliminated against construction materials to arrive at the external operating revenue total for the segment.

Contract balances

The changes in contract assets and liabilities were as follows:

	March 31, 2020			December 31, 2019			Change			Location on Consolidated Balance Sheets
	(In thousands)
Contract assets	$	121,321		$	109,078		$	12,243		Receivables, net
Contract liabilities - current	(153,230		)	(142,768		)	(10,462		)	Accounts payable
Contract liabilities - noncurrent	(81		)	(19		)	(62		)	Noncurrent liabilities - other
Net contract liabilities	$	(31,990	)	$	(33,709	)	$	1,719