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Business segment data
 9 Months Ended
Sep. 30, 2020
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 vast majority of 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, underground storage and gathering services through regulated and non-regulated pipeline systems primarily in the Rocky Mountain and northern Great Plains regions of the United States. This segment also provides 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-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, including Alaska and Hawaii.
The construction services segment provides inside and outside specialty contracting services. 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 government 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 1 of the Notes to Consolidated Financial Statements in the 2019 Annual Report. Information on the Company's segments was as follows:
Three Months EndedNine Months Ended
September 30,September 30,
 2020 2019 2020 2019 
 (In thousands)
External operating revenues:   
Regulated operations:
Electric$87,447 $89,845 $249,793 $263,423 
Natural gas distribution94,703 93,642 562,641 569,656 
Pipeline27,965 25,957 57,717 52,230 
 210,115 209,444 870,151 885,309 
Non-regulated operations:
Pipeline4,103 6,576 12,664 17,597 
Construction materials and contracting822,439 869,376 1,705,629 1,692,287 
Construction services550,608 478,381 1,559,217 1,363,305 
Other24 22 (70)65 
 1,377,174 1,354,355 3,277,440 3,073,254 
Total external operating revenues$1,587,289 $1,563,799 $4,147,591 $3,958,563 
Three Months EndedNine Months Ended
September 30,September 30,
 2020 2019 2020 2019 
 (In thousands)
Intersegment operating revenues:    
Regulated operations:
Electric$195 $— $586 $— 
Natural gas distribution185 — 555 — 
Pipeline3,543 3,750 36,583 35,098 
3,923 3,750 37,724 35,098 
Non-regulated operations:
Pipeline79 81 237 200 
Construction materials and contracting110 124 262 388 
Construction services425 1,226 3,674 2,076 
Other3,006 2,862 8,952 13,566 
3,620 4,293 13,125 16,230 
Intersegment eliminations(7,543)(8,043)(50,849)(51,328)
Total intersegment operating revenues$— $— $— $— 
Operating income (loss):
Electric$21,159 $21,930 $48,827 $49,708 
Natural gas distribution(18,393)(15,565)32,285 32,132 
Pipeline11,762 11,416 35,406 32,017 
Construction materials and contracting148,522 143,024 179,994 147,622 
Construction services40,507 29,950 102,185 89,381 
Other154 (1,285)339 140 
Total operating income$203,711 $189,470 $399,036 $351,000 
Net income (loss):
Regulated operations:
Electric$16,787 $16,291 $40,314 $39,267 
Natural gas distribution(17,614)(15,625)13,795 14,623 
Pipeline7,812 6,933 23,882 20,316 
6,985 7,599 77,991 74,206 
Non-regulated operations:
Pipeline189 801 444 1,380 
Construction materials and contracting107,307 102,611 122,113 97,328 
Construction services29,789 21,113 74,544 63,982 
Other8,745 4,004 3,303 3,466 
146,030 128,529 200,404 166,156 
Income from continuing operations153,015 136,128 278,395 240,362 
Income (loss) from discontinued operations, net of tax63 1,509 (484)26 
Net income$153,078 $137,637 $277,911 $240,388