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Business segment data
 3 Months Ended
Mar. 31, 2023
Segment Reporting [Abstract]  
Business segment data Business segment data
The Company's reportable segments are those that are based on the Company's method of internal reporting, which generally segregates the strategic business units due to differences in products, services and regulation. The internal reporting of these operating segments is defined based on the reporting and review process used by the Company's chief executive officer. The Company's operations are located within the United States.
The electric segment generates, transmits and distributes electricity in Montana, North Dakota, South Dakota and Wyoming. The natural gas distribution segment distributes natural gas in those states, as well as in Idaho, Minnesota, Oregon and Washington. These operations also supply related value-added services.
The pipeline segment provides natural gas transportation and underground storage services through a regulated pipeline system primarily in the Rocky Mountain and northern Great Plains regions of the United States. This segment also provides non-regulated cathodic protection services.
The construction materials and contracting segment mines, processes and sells construction aggregates (crushed stone and sand and gravel); produces and sells asphalt; and supplies ready-mix concrete. This segment's aggregate reserves provide the foundation for the vertical integration of its contracting services with its construction materials to support its aggregate-based product lines including heavy-civil construction, asphalt paving, concrete construction and site development and grading. Although not common to all locations, the segment also includes the sale of cement, liquid asphalt modification and distribution, various finished concrete products, merchandise and other building materials and related contracting services. This segment operates in the central, southern and western United States, including Alaska and Hawaii.
The construction services segment provides a full spectrum of construction services through its electrical and mechanical and transmission and distribution specialty contracting services across the United States. These specialty contracting services are provided to utilities, manufacturing, transportation, commercial, industrial, institutional, renewable and governmental customers. Its electrical and mechanical contracting services include construction and maintenance of electrical and communication wiring and infrastructure, fire suppression systems, and mechanical piping and services. Its transmission and distribution contracting services include construction and maintenance of overhead and underground electrical, gas and communication infrastructure, as well as manufacturing and distribution of transmission line construction equipment and tools.
The Other category includes the activities of Centennial Capital, which, through its subsidiary InterSource Insurance Company, insures various types of risks as a captive insurer for certain of the Company's subsidiaries. The function of the captive insurer is to fund the self-insured layers of the insured Company's general liability, automobile liability, pollution liability and other coverages. Centennial Capital also owns certain real and personal property. In addition, the Other category includes certain assets, liabilities and tax adjustments of the holding company primarily associated with corporate functions, as well as costs associated with the announced strategic initiatives. Also included are certain general and administrative costs (reflected in operation and maintenance expense) and interest expense, which were previously allocated to the refining business and Fidelity and do not meet the criteria for income (loss) from discontinued operations.
Discontinued operations include the supporting activities of Fidelity other than certain general and administrative costs and interest expense as described above.
The information below follows the same accounting policies as described in Note 2 of the Notes to Consolidated Financial Statements in the 2022 Annual Report. Information on the Company's segments was as follows:
Three Months Ended
March 31,
 2023 2022 
 (In thousands)
External operating revenues: 
Regulated operations:
Electric$95,602 $93,594 
Natural gas distribution565,517 450,418 
Pipeline12,638 9,444 
 673,757 553,456 
Non-regulated operations:
Pipeline1,693 1,676 
Construction materials and contracting307,768 309,836 
Construction services754,119 551,591 
Other— — 
 1,063,580 863,103 
Total external operating revenues$1,737,337 $1,416,559 
Three Months Ended
March 31,
 2023 2022 
 (In thousands)
Intersegment operating revenues:  
Regulated operations:
Electric$122 $124 
Natural gas distribution150 136 
Pipeline26,259 25,933 
26,531 26,193 
Non-regulated operations:
Pipeline151 7 
Construction materials and contracting132 130 
Construction services214 1,059 
Other4,739 4,341 
5,236 5,537 
Total intersegment operating revenues$31,767 $31,730 
Operating income (loss):
Electric$21,091 $15,044 
Natural gas distribution58,505 56,256 
Pipeline13,040 11,882 
Construction materials and contracting(44,563)(44,605)
Construction services35,217 29,498 
Other(8,818)(732)
Total operating income$74,472 $67,343 
Net income (loss):
Regulated operations:
Electric$16,607 $11,278 
Natural gas distribution38,928 36,315 
Pipeline8,759 7,956 
64,294 55,549 
Non-regulated operations:
Pipeline(460)(619)
Construction materials and contracting(41,320)(40,010)
Construction services26,074 21,324 
Other(10,245)(4,511)
(25,951)(23,816)
Income from continuing operations38,343 31,733 
Discontinued operations, net of tax10 30 
Net income$38,353 $31,763 
A reconciliation of reportable segment operating revenues to consolidated operating revenues is as follows:
Three Months Ended
March 31,
2023 2022 
(In thousands)
Operating revenues reconciliation:
Total reportable segment operating revenues$1,764,365 $1,443,948 
Other revenue4,739 4,341 
Elimination of intersegment operating revenues(31,767)(31,730)
Total consolidated operating revenues$1,737,337 $1,416,559