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Revenue from contracts with customers (Tables)
 3 Months Ended
Mar. 31, 2023
Revenue from Contract with Customer [Abstract]  
Disaggregation of revenue
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, 2023ElectricNatural gas
distribution		PipelineConstruction
materials and
contracting		Construction
services		OtherTotal
(In thousands)
Residential utility sales
$37,825 $327,651 $— $— $— $— $365,476 
Commercial utility sales
36,347 204,927 — — — — 241,274 
Industrial utility sales
10,763 16,838 — — — — 27,601 
Other utility sales
1,774 — — — — — 1,774 
Natural gas transportation
— 13,504 34,983 — — — 48,487 
Natural gas storage
— — 3,861 — — — 3,861 
Contracting services
— — — 114,983 — — 114,983 
Construction materials
— — — 232,502 — — 232,502 
Intrasegment eliminations— — — (39,585)— — (39,585)
Electrical & mechanical specialty contracting— — — — 590,263 — 590,263 
Transmission & distribution specialty contracting— — — — 152,022 — 152,022 
Other
11,878 4,721 1,859 — 33 4,739 23,230 
Intersegment eliminations
(122)(150)(26,410)(132)(214)(4,739)(31,767)
Revenues from contracts with customers
98,465 567,491 14,293 307,768 742,104 — 1,730,121 
Revenues out of scope(2,863)(1,974)38 — 12,015 — 7,216 
Total external operating revenues
$95,602 $565,517 $14,331 $307,768 $754,119 $— $1,737,337 
Three Months Ended March 31, 2022ElectricNatural gas
distribution		PipelineConstruction
materials and
contracting		Construction
services		OtherTotal
(In thousands)
Residential utility sales
$37,304 $258,816 $— $— $— $— $296,120 
Commercial utility sales
35,600 163,609 — — — — 199,209 
Industrial utility sales
10,306 13,024 — — — — 23,330 
Other utility sales
1,750 — — — — — 1,750 
Natural gas transportation
— 12,381 31,574 — — — 43,955 
Natural gas storage
— — 3,719 — — — 3,719 
Contracting services
— — — 114,267 — — 114,267 
Construction materials
— — — 241,732 — — 241,732 
Intrasegment eliminations— — — (46,033)— — (46,033)
Electrical & mechanical specialty contracting— — — — 392,808 — 392,808 
Transmission & distribution specialty contracting— — — — 148,466 — 148,466 
Other
12,753 2,609 1,709 — 48 4,341 21,460 
Intersegment eliminations
(124)(136)(25,940)(130)(1,059)(4,341)(31,730)
Revenues from contracts with customers
97,589 450,303 11,062 309,836 540,263 — 1,409,053 
Revenues out of scope(3,995)115 58 — 11,328 — 7,506 
Total external operating revenues
$93,594 $450,418 $11,120 $309,836 $551,591 $— $1,416,559 
Contract balances
The changes in contract assets and liabilities were as follows:
March 31, 2023December 31, 2022ChangeLocation on Consolidated Balance Sheets
(In thousands)
Contract assets
$212,687 $185,289 $27,398 Receivables, net
Contract liabilities - current(202,788)(208,204)5,416 Accounts payable
Contract liabilities - noncurrent(442)(6)(436)Noncurrent liabilities - other
Net contract assets (liabilities)$9,457 $(22,921)$32,378