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Business segment data
 6 Months Ended
Jun. 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 nonregulated 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 EndedSix Months Ended
June 30,June 30,
 2020  2019  2020  2019  
 (In thousands)
External operating revenues:   
Regulated operations:
Electric$76,438  $81,011  $162,346  $173,578  
Natural gas distribution141,494  133,867  467,937  476,014  
Pipeline23,421  21,369  29,752  26,272  
 241,353  236,247  660,035  675,864  
Nonregulated operations:
Pipeline4,237  7,311  8,561  11,021  
Construction materials and contracting621,045  595,799  883,190  822,911  
Construction services496,405  464,192  1,008,610  884,925  
Other(112) 24  (94) 43  
 1,121,575  1,067,326  1,900,267  1,718,900  
Total external operating revenues$1,362,928  $1,303,573  $2,560,302  $2,394,764  
Intersegment operating revenues:    
Regulated operations:
Electric$196  $—  $391  $—  
Natural gas distribution185  —  370  —  
Pipeline7,857  7,426  33,040  31,349  
8,238  7,426  33,801  31,349  
Nonregulated operations:
Pipeline142  87  158  119  
Construction materials and contracting90  168  152  264  
Construction services779  721  3,249  849  
Other2,973  2,879  5,946  10,704  
3,984  3,855  9,505  11,936  
Intersegment eliminations(12,222) (11,281) (43,306) (43,285) 
Total intersegment operating revenues$—  $—  $—  $—  
Three Months EndedSix Months Ended
June 30,June 30,
 2020  2019  2020  2019  
 (In thousands)
Operating income (loss):
Electric$12,810  $9,791  $27,669  $27,779  
Natural gas distribution678  (2,621) 50,677  47,696  
Pipeline12,225  10,698  23,644  20,602  
Construction materials and contracting74,741  46,178  31,472  4,597  
Construction services37,882  31,966  61,678  59,431  
Other(82) 1,299  185  1,425  
Total operating income$138,254  $97,311  $195,325  $161,530  
Net income (loss):
Regulated operations:
Electric$12,153  $7,471  $23,527  $22,976  
Natural gas distribution(959) (6,252) 31,410  30,248  
Pipeline8,684  6,378  16,070  13,382  
19,878  7,597  71,007  66,606  
Nonregulated operations:
Pipeline268  742  255  579  
Construction materials and contracting53,020  29,166  14,806  (5,283) 
Construction services27,932  22,845  44,755  42,869  
Other(1,256) 2,795  (5,442) (537) 
79,964  55,548  54,374  37,628  
Income from continuing operations99,842  63,145  125,381  104,234  
Loss from discontinued operations, net of tax(139) (1,320) (548) (1,483) 
Net income$99,703  $61,825  $124,833  $102,751