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Business segment data
 6 Months Ended
Jun. 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 EndedSix Months Ended
June 30,June 30,
 2021 2020 2021 2020 
 (In thousands)
External operating revenues:   
Regulated operations:
Electric$83,650 $76,438 $168,324 $162,346 
Natural gas distribution153,788 141,494 503,994 467,937 
Pipeline23,130 23,421 30,633 29,752 
 260,568 241,353 702,951 660,035 
Non-regulated operations:
Pipeline4,643 4,237 7,052 8,561 
Construction materials and contracting633,674 621,045 899,333 883,190 
Construction services524,744 496,405 1,042,214 1,008,610 
Other28 (112)45 (94)
 1,163,089 1,121,575 1,948,644 1,900,267 
Total external operating revenues$1,423,657 $1,362,928 $2,651,595 $2,560,302 
Three Months EndedSix Months Ended
June 30,June 30,
 2021 2020 2021 2020 
 (In thousands)
Intersegment operating revenues:    
Regulated operations:
Electric$136 $196 $271 $391 
Natural gas distribution142 185 284 370 
Pipeline7,695 7,857 33,685 33,040 
7,973 8,238 34,240 33,801 
Non-regulated operations:
Pipeline167 142 407 158 
Construction materials and contracting142 90 204 152 
Construction services797 779 1,839 3,249 
Other3,361 2,973 6,685 5,946 
4,467 3,984 9,135 9,505 
Intersegment eliminations(12,440)(12,222)(43,375)(43,306)
Total intersegment operating revenues$— $— $— $— 
Operating income (loss):
Electric$12,806 $12,810 $26,672 $27,669 
Natural gas distribution3,601 678 57,173 50,677 
Pipeline11,076 12,225 23,612 23,644 
Construction materials and contracting72,452 74,741 37,563 31,472 
Construction services37,774 37,882 78,051 61,678 
Other(20)(82)(218)185 
Total operating income$137,689 $138,254 $222,853 $195,325 
Net income (loss):
Regulated operations:
Electric$10,304 $12,153 $21,054 $23,527 
Natural gas distribution(707)(959)35,471 31,410 
Pipeline8,089 8,684 17,283 16,070 
17,686 19,878 73,808 71,007 
Non-regulated operations:
Pipeline1,106 268 810 255 
Construction materials and contracting51,396 53,020 20,584 14,806 
Construction services28,885 27,932 58,709 44,755 
Other1,098 (1,256)(1,624)(5,442)
82,485 79,964 78,479 54,374 
Income from continuing operations100,171 99,842 152,287 125,381 
Income (loss) from discontinued operations, net of tax19 (139)34 (548)
Net income$100,190 $99,703 $152,321 $124,833