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Revenue from contracts with customers
 3 Months Ended
Mar. 31, 2021
Revenue from Contract with Customer [Abstract]  
Revenue from contracts with customers Revenue from contracts with customers
Revenue is recognized when a performance obligation is satisfied by transferring control over a product or service to a customer. Revenue is measured based on consideration specified in a contract with a customer and excludes any sales incentives and amounts collected on behalf of third parties. The Company is considered an agent for certain taxes collected from customers. As such, the Company presents revenues net of these taxes at the time of sale to be remitted to governmental authorities, including sales and use taxes.
Disaggregation
In the following tables, 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 17.
Three Months Ended March 31, 2021ElectricNatural gas
distribution		PipelineConstruction
materials and
contracting		Construction
services		OtherTotal
(In thousands)
Residential utility sales
$33,436 $203,137 $— $— $— $— $236,573 
Commercial utility sales
32,928 120,052 — — — — 152,980 
Industrial utility sales
10,029 8,812 — — — — 18,841 
Other utility sales
1,566 — — — — — 1,566 
Natural gas transportation
— 12,452 29,417 — — — 41,869 
Natural gas storage
— — 4,029 — — — 4,029 
Contracting services
— — — 96,025 — — 96,025 
Construction materials
— — — 216,412 — — 216,412 
Intrasegment eliminations— — — (46,716)— — (46,716)
Inside specialty contracting
— — — — 355,190 — 355,190 
Outside specialty contracting
— — — — 151,363 — 151,363 
Other
9,773 3,009 2,660 — 36 3,341 18,819 
Intersegment eliminations
(136)(142)(26,229)(62)(1,042)(3,324)(30,935)
Revenues from contracts with customers
87,596 347,320 9,877 265,659 505,547 17 1,216,016 
Revenues out of scope
(2,923)2,886 36 — 11,923 — 11,922 
Total external operating revenues
$84,673 $350,206 $9,913 $265,659 $517,470 $17 $1,227,938 
Three Months Ended March 31, 2020ElectricNatural gas
distribution		PipelineConstruction
materials and
contracting		Construction
services		OtherTotal
(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 
Presented in the previous tables are intrasegment revenues 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 timing of revenue recognition may differ from the timing of invoicing to customers. The timing of invoicing to customers does not necessarily correlate with the timing of revenues being recognized under the cost-to-cost method of accounting. Contracts from contracting services are billed as work progresses in accordance with agreed upon contractual terms. Generally, billing to the customer occurs contemporaneous to revenue recognition. A variance in timing of the billings may result in a contract asset or a contract liability. A contract asset occurs when revenues are recognized under the cost-to-cost measure of progress, which exceeds amounts billed on uncompleted contracts. Such amounts will be billed as standard contract terms allow, usually based on various measures of performance or achievement. A contract liability occurs when there are billings in excess of revenues recognized under the cost-to-cost measure of progress on uncompleted contracts. Contract liabilities decrease as revenue is recognized from the satisfaction of the related performance obligation.
The changes in contract assets and liabilities were as follows:
March 31, 2021December 31, 2020ChangeLocation on Consolidated Balance Sheets
(In thousands)
Contract assets
$107,543 $104,345 $3,198 Receivables, net
Contract liabilities - current(142,828)(158,603)15,775 Accounts payable
Contract liabilities - noncurrent(171)(52)(119)Noncurrent liabilities - other
Net contract liabilities$(35,456)$(54,310)$18,854 
The Company recognized $123.4 million in revenue for the three months ended March 31, 2021, which was previously included in contract liabilities at December 31, 2020. The Company recognized $89.4 million in revenue for the three months ended March 31, 2020, which was previously included in contract liabilities at December 31, 2019.
The Company recognized a net increase in revenues of $34.3 million and $19.5 million for the three months ended March 31, 2021 and 2020, respectively, from performance obligations satisfied in prior periods.
Remaining performance obligations
The remaining performance obligations, also referred to as backlog, at the construction materials and contracting and construction services segments include unrecognized revenues that the Company reasonably expects to be realized. These unrecognized revenues can include: projects that have a written award, a letter of intent, a notice to proceed, an agreed upon work order to perform work on mutually accepted terms and conditions and change orders or claims to the extent management believes additional contract revenues will be earned and are deemed probable of collection. Excluded from remaining performance obligations are potential orders under master service agreements. The majority of the Company's construction contracts have an original duration of less than two years.
The remaining performance obligations at the pipeline segment include firm transportation and storage contracts with fixed pricing and fixed volumes. The Company has applied the practical expedient, which does not require additional disclosures for contracts with an original duration of less than 12 months, to certain firm transportation and non-regulated contracts. The Company's firm transportation and firm storage contracts included in the remaining performance obligations have weighted average remaining durations of approximately five and one years, respectively.
At March 31, 2021, the Company's remaining performance obligations were $2.2 billion. The Company expects to recognize the following revenue amounts in future periods related to these remaining performance obligations: $1.7 billion within the next 12 months or less; $283.8 million within the next 13 to 24 months; and $213.4 million in 25 months or more.