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Business segment data
 3 Months Ended
Mar. 31, 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 44 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 Ended
March 31,
 2021 2020 
 (In thousands)
External operating revenues:  
Regulated operations:
Electric$84,673 $85,908 
Natural gas distribution350,206 326,443 
Pipeline7,502 6,331 
 442,381 418,682 
Non-regulated operations:
Pipeline2,411 4,324 
Construction materials and contracting265,659 262,144 
Construction services517,470 512,205 
Other17 18 
 785,557 778,691 
Total external operating revenues$1,227,938 $1,197,373 
Three Months Ended
March 31,
 2021 2020 
 (In thousands)
Intersegment operating revenues:  
Regulated operations:
Electric$136 $195 
Natural gas distribution142 185 
Pipeline25,990 25,183 
26,268 25,563 
Non-regulated operations:
Pipeline239 16 
Construction materials and contracting62 63 
Construction services1,042 2,470 
Other3,324 2,973 
4,667 5,522 
Intersegment eliminations(30,935)(31,085)
Total intersegment operating revenues$— $— 
Operating income (loss):
Electric$13,865 $14,859 
Natural gas distribution53,573 49,998 
Pipeline12,536 11,419 
Construction materials and contracting(34,889)(43,269)
Construction services40,277 23,796 
Other(198)267 
Total operating income$85,164 $57,070 
Net income (loss):
Regulated operations:
Electric$10,749 $11,374 
Natural gas distribution36,178 32,369 
Pipeline9,194 7,386 
56,121 51,129 
Non-regulated operations:
Pipeline(296)(13)
Construction materials and contracting(30,813)(38,215)
Construction services29,825 16,823 
Other(2,721)(4,185)
(4,005)(25,590)
Income from continuing operations52,116 25,539 
Income (loss) from discontinued operations, net of tax15 (409)
Net income$52,131 $25,130