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Business segment data
 9 Months Ended
Sep. 30, 2022
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.
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-mix 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, asphalt oil 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, 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 and 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 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, as well as transaction costs associated with the anticipated separation of Knife River.
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 2021 Annual Report. Information on the Company's segments was as follows:
Three Months EndedNine Months Ended
September 30,September 30,
 2022 2021 2022 2021 
 (In thousands)
External operating revenues:   
Regulated operations:
Electric$99,193 $98,930 $278,249 $267,254 
Natural gas distribution132,074 110,378 792,932 614,373 
Pipeline32,347 27,757 69,347 58,390 
 263,614 237,065 1,140,528 940,017 
Three Months EndedNine Months Ended
September 30,September 30,
 2022 2021 2022 2021 
 (In thousands)
Non-regulated operations:
Pipeline3,698 3,211 7,630 10,263 
Construction materials and contracting975,085 831,189 1,996,533 1,730,521 
Construction services734,809 514,523 1,969,995 1,556,737 
Other— 25 — 70 
 1,713,592 1,348,948 3,974,158 3,297,591 
Total external operating revenues$1,977,206 $1,586,013 $5,114,686 $4,237,608 
Intersegment operating revenues:    
Regulated operations:
Electric$124 $136 $371 $407 
Natural gas distribution139 142 416 425 
Pipeline3,508 3,845 36,845 37,530 
3,771 4,123 37,632 38,362 
Non-regulated operations:
Pipeline87 63 483 470 
Construction materials and contracting343 110 674 314 
Construction services2,229 289 5,090 2,128 
Other4,438 3,398 13,168 10,082 
7,097 3,860 19,415 12,994 
Intersegment eliminations(10,868)(7,983)(57,047)(51,356)
Total intersegment operating revenues$— $— $— $— 
Operating income (loss):
Electric$30,395 $27,310 $53,764 $53,982 
Natural gas distribution(16,688)(14,249)38,929 42,925 
Pipeline14,963 12,284 39,447 35,896 
Construction materials and contracting147,367 133,712 157,116 171,274 
Construction services34,949 30,120 110,588 108,172 
Other(1,135)(8)(2,081)(226)
Total operating income$209,851 $189,169 $397,763 $412,023 
Net income (loss):
Regulated operations:
Electric$21,596 $20,564 $37,476 $41,618 
Natural gas distribution(18,058)(15,390)10,758 20,081 
Pipeline9,379 10,225 24,527 27,508 
12,917 15,399 72,761 89,207 
Non-regulated operations:
Pipeline492 356 (187)1,166 
Construction materials and contracting102,764 96,282 95,337 116,865 
Construction services27,977 23,130 83,755 81,839 
Other3,783 3,795 (1,368)2,172 
135,016 123,563 177,537 202,042 
Income from continuing operations147,933 138,962 250,298 291,249 
Discontinued operations, net of tax38 314 103 348 
Net income$147,971 $139,276 $250,401 $291,597