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Business segment data
 9 Months Ended
Sep. 30, 2021
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 and other energy-related services. In 2020, the pipeline segment divested its regulated and non-regulated natural gas gathering assets. With the completion of these sales, the segment exited the natural gas gathering business.
The construction materials and contracting segment mines, processes and sells construction aggregates (crushed stone, sand and gravel); produces and sells asphalt mix; and supplies ready-mixed concrete. This segment focuses on vertical integration of its contracting services with its construction materials to support the aggregate-based product lines including aggregate placement, asphalt and concrete paving, and site development and grading. Although not common to all locations, other products include the sale of cement, liquid asphalt for various commercial and roadway applications, various finished concrete products and other building materials and related contracting services. This segment operates in the central, southern and western United States, as well as Alaska and Hawaii.
The construction services segment provides inside and outside specialty contracting services in 43 states plus Washington D.C. Its inside services include design, construction and maintenance of electrical and communication wiring and infrastructure, fire suppression systems, and mechanical piping and services. Its outside services include design, construction and maintenance of overhead and underground electrical distribution and transmission lines, substations, external lighting, traffic signalization, and gas pipelines, as well as utility excavation and the manufacture and distribution of transmission line construction equipment. This segment also constructs and maintains renewable energy projects. These specialty contracting services are provided to utilities and large manufacturing, commercial, industrial, institutional and governmental customers.
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 and 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. The Other category also includes Centennial Resources' former investment in Brazil.
Discontinued operations include the results and 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 2020 Annual Report. Information on the Company's segments was as follows:
Three Months EndedNine Months Ended
September 30,September 30,
 2021 2020 2021 2020 
 (In thousands)
External operating revenues:   
Regulated operations:
Electric$98,930 $87,447 $267,254 $249,793 
Natural gas distribution110,378 94,703 614,373 562,641 
Pipeline27,757 27,965 58,390 57,717 
 237,065 210,115 940,017 870,151 
Non-regulated operations:
Pipeline3,211 4,103 10,263 12,664 
Construction materials and contracting831,189 822,439 1,730,521 1,705,629 
Construction services514,523 550,608 1,556,737 1,559,217 
Other25 24 70 (70)
 1,348,948 1,377,174 3,297,591 3,277,440 
Total external operating revenues$1,586,013 $1,587,289 $4,237,608 $4,147,591 
Three Months EndedNine Months Ended
September 30,September 30,
 2021 2020 2021 2020 
 (In thousands)
Intersegment operating revenues:    
Regulated operations:
Electric$136 $195 $407 $586 
Natural gas distribution142 185 425 555 
Pipeline3,845 3,543 37,530 36,583 
4,123 3,923 38,362 37,724 
Non-regulated operations:
Pipeline63 79 470 237 
Construction materials and contracting110 110 314 262 
Construction services289 425 2,128 3,674 
Other3,398 3,006 10,082 8,952 
3,860 3,620 12,994 13,125 
Intersegment eliminations(7,983)(7,543)(51,356)(50,849)
Total intersegment operating revenues$— $— $— $— 
Operating income (loss):
Electric$27,310 $21,159 $53,982 $48,827 
Natural gas distribution(14,249)(18,393)42,925 32,285 
Pipeline12,284 11,762 35,896 35,406 
Construction materials and contracting133,712 148,522 171,274 179,994 
Construction services30,120 40,507 108,172 102,185 
Other(8)154 (226)339 
Total operating income$189,169 $203,711 $412,023 $399,036 
Net income (loss):
Regulated operations:
Electric$20,564 $16,787 $41,618 $40,314 
Natural gas distribution(15,390)(17,614)20,081 13,795 
Pipeline10,225 7,812 27,508 23,882 
15,399 6,985 89,207 77,991 
Non-regulated operations:
Pipeline356 189 1,166 444 
Construction materials and contracting96,282 107,307 116,865 122,113 
Construction services23,130 29,789 81,839 74,544 
Other3,795 8,745 2,172 3,303 
123,563 146,030 202,042 200,404 
Income from continuing operations138,962 153,015 291,249 278,395 
Income (loss) from discontinued operations, net of tax314 63 348 (484)
Net income$139,276 $153,078 $291,597 $277,911