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Revenue from contracts with customers
 6 Months Ended
Jun. 30, 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 June 30, 2021ElectricNatural gas
distribution		PipelineConstruction
materials and
contracting		Construction
services		OtherTotal
(In thousands)
Residential utility sales
$29,258 $83,480 $— $— $— $— $112,738 
Commercial utility sales
33,834 47,612 — — — — 81,446 
Industrial utility sales
10,354 6,180 — — — — 16,534 
Other utility sales
1,825 — — — — — 1,825 
Natural gas transportation
— 11,451 27,685 — — — 39,136 
Natural gas storage
— — 3,094 — — — 3,094 
Contracting services
— — — 280,834 — — 280,834 
Construction materials
— — — 498,762 — — 498,762 
Intrasegment eliminations— — — (145,780)— — (145,780)
Inside specialty contracting
— — — — 347,702 — 347,702 
Outside specialty contracting
— — — — 165,123 — 165,123 
Other
9,465 2,794 4,810 — 57 3,389 20,515 
Intersegment eliminations
(136)(142)(7,862)(142)(797)(3,361)(12,440)
Revenues from contracts with customers
84,600 151,375 27,727 633,674 512,085 28 1,409,489 
Revenues out of scope
(950)2,413 46 — 12,659 — 14,168 
Total external operating revenues
$83,650 $153,788 $27,773 $633,674 $524,744 $28 $1,423,657 
Three Months Ended June 30, 2020ElectricNatural gas
distribution		PipelineConstruction
materials and
contracting		Construction
services		OtherTotal
(In thousands)
Residential utility sales
$27,954 $78,653 $— $— $— $— $106,607 
Commercial utility sales
29,877 41,027 — — — — 70,904 
Industrial utility sales
8,072 5,658 — — — — 13,730 
Other utility sales
1,591 — — — — — 1,591 
Natural gas transportation
— 10,350 27,965 — — — 38,315 
Natural gas gathering
— — 1,181 — — — 1,181 
Natural gas storage
— — 3,104 — — — 3,104 
Contracting services
— — — 303,356 — — 303,356 
Construction materials
— — — 482,498 — — 482,498 
Intrasegment eliminations— — — (164,719)— — (164,719)
Inside specialty contracting
— — — — 324,921 — 324,921 
Outside specialty contracting
— — — — 160,696 — 160,696 
Other
7,717 2,711 3,363 — 412 2,861 17,064 
Intersegment eliminations
(196)(185)(7,999)(90)(779)(2,973)(12,222)
Revenues from contracts with customers
75,015 138,214 27,614 621,045 485,250 (112)1,347,026 
Revenues out of scope
1,423 3,280 44 — 11,155 — 15,902 
Total external operating revenues
$76,438 $141,494 $27,658 $621,045 $496,405 $(112)$1,362,928 
Six Months Ended June 30, 2021ElectricNatural gas
distribution		PipelineConstruction
materials and
contracting		Construction
services		OtherTotal
(In thousands)
Residential utility sales
$62,694 $286,617 $— $— $— $— $349,311 
Commercial utility sales
66,762 167,664 — — — — 234,426 
Industrial utility sales
20,383 14,992 — — — — 35,375 
Other utility sales
3,391 — — — — — 3,391 
Natural gas transportation
— 23,903 57,102 — — — 81,005 
Natural gas storage
— — 7,123 — — — 7,123 
Contracting services
— — — 376,859 — — 376,859 
Construction materials
— — — 715,174 — — 715,174 
Intrasegment eliminations— — — (192,496)— — (192,496)
Inside specialty contracting
— — — — 702,892 — 702,892 
Outside specialty contracting
— — — — 316,486 — 316,486 
Other
19,238 5,803 7,470 — 93 6,730 39,334 
Intersegment eliminations
(271)(284)(34,092)(204)(1,839)(6,685)(43,375)
Revenues from contracts with customers
172,197 498,695 37,603 899,333 1,017,632 45 2,625,505 
Revenues out of scope
(3,873)5,299 82 — 24,582 — 26,090 
Total external operating revenues
$168,324 $503,994 $37,685 $899,333 $1,042,214 $45 $2,651,595 
Six Months Ended June 30, 2020ElectricNatural gas
distribution		PipelineConstruction
materials and
contracting		Construction
services		OtherTotal
(In thousands)
Residential utility sales
$60,303 $265,354 $— $— $— $— $325,657 
Commercial utility sales
63,464 156,023 — — — — 219,487 
Industrial utility sales
18,439 14,179 — — — — 32,618 
Other utility sales
3,239 — — — — — 3,239 
Natural gas transportation
— 22,148 55,397 — — — 77,545 
Natural gas gathering
— — 3,271 — — — 3,271 
Natural gas storage
— — 6,150 — — — 6,150 
Contracting services
— — — 401,757 — — 401,757 
Construction materials
— — — 690,408 — — 690,408 
Intrasegment eliminations— — — (208,823)— — (208,823)
Inside specialty contracting
— — — — 697,130 — 697,130 
Outside specialty contracting
— — — — 290,846 — 290,846 
Other
16,167 5,209 6,604 — 763 5,852 34,595 
Intersegment eliminations
(391)(370)(33,198)(152)(3,249)(5,946)(43,306)
Revenues from contracts with customers
161,221 462,543 38,224 883,190 985,490 (94)2,530,574 
Revenues out of scope
1,125 5,394 89 — 23,120 — 29,728 
Total external operating revenues
$162,346 $467,937 $38,313 $883,190 $1,008,610 $(94)$2,560,302 
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:
June 30, 2021December 31, 2020ChangeLocation on Consolidated Balance Sheets
(In thousands)
Contract assets
$147,033 $104,345 $42,688 Receivables, net
Contract liabilities - current(146,116)(158,603)12,487 Accounts payable
Contract liabilities - noncurrent(160)(52)(108)Noncurrent liabilities - other
Net contract assets (liabilities)$757 $(54,310)$55,067 
The Company recognized $21.9 million and $145.3 million in revenue for the three and six months ended June 30, 2021, respectively, which was previously included in contract liabilities at December 31, 2020. The Company recognized $32.3 million and $121.7 million in revenue for the three and six months ended June 30, 2020, respectively, which was previously included in contract liabilities at December 31, 2019.
The Company recognized a net increase in revenues of $27.3 million and $54.6 million for the three and six months ended June 30, 2021, respectively, from performance obligations satisfied in prior periods. The Company recognized a net increase in revenues of $31.9 million and $42.9 million for the three and six months ended June 30, 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 June 30, 2021, the Company's remaining performance obligations were $2.4 billion. The Company expects to recognize the following revenue amounts in future periods related to these remaining performance obligations: $1.8 billion within the next 12 months or less; $339.5 million within the next 13 to 24 months; and $225.9 million in 25 months or more.