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Business segment data
 6 Months Ended
Jun. 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.
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 EndedSix Months Ended
June 30,June 30,
 2022 2021 2022 2021 
 (In thousands)
External operating revenues:   
Regulated operations:
Electric$85,461 $83,650 $179,056 $168,324 
Natural gas distribution210,440 153,788 660,858 503,994 
Pipeline27,556 23,130 36,999 30,633 
 323,457 260,568 876,913 702,951 
Non-regulated operations:
Pipeline2,257 4,643 3,933 7,052 
Construction materials and contracting711,613 633,674 1,021,448 899,333 
Construction services683,594 524,744 1,235,186 1,042,214 
Other— 28 — 45 
 1,397,464 1,163,089 2,260,567 1,948,644 
Total external operating revenues$1,720,921 $1,423,657 $3,137,480 $2,651,595 
Three Months EndedSix Months Ended
June 30,June 30,
 2022 2021 2022 2021 
 (In thousands)
Intersegment operating revenues:    
Regulated operations:
Electric$124 $136 $247 $271 
Natural gas distribution141 142 277 284 
Pipeline7,404 7,695 33,338 33,685 
7,669 7,973 33,862 34,240 
Non-regulated operations:
Pipeline388 167 396 407 
Construction materials and contracting200 142 330 204 
Construction services1,803 797 2,861 1,839 
Other4,389 3,361 8,730 6,685 
6,780 4,467 12,317 9,135 
Intersegment eliminations(14,449)(12,440)(46,179)(43,375)
Total intersegment operating revenues$— $— $— $— 
Operating income (loss):
Electric$8,325 $12,806 $23,369 $26,672 
Natural gas distribution(638)3,601 55,617 57,173 
Pipeline12,602 11,076 24,484 23,612 
Construction materials and contracting54,354 72,452 9,749 37,563 
Construction services46,141 37,774 75,639 78,051 
Other(214)(20)(946)(218)
Total operating income$120,570 $137,689 $187,912 $222,853 
Net income (loss):
Regulated operations:
Electric$4,601 $10,304 $15,880 $21,054 
Natural gas distribution(7,498)(707)28,817 35,471 
Pipeline7,191 8,089 15,147 17,283 
4,294 17,686 59,844 73,808 
Non-regulated operations:
Pipeline(60)1,106 (679)810 
Construction materials and contracting32,584 51,396 (7,427)20,584 
Construction services34,454 28,885 55,778 58,709 
Other(640)1,098 (5,151)(1,624)
66,338 82,485 42,521 78,479 
Income from continuing operations70,632 100,171 102,365 152,287 
Discontinued operations, net of tax35 19 65 34 
Net income$70,667 $100,190 $102,430 $152,321