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Business segment data
 9 Months Ended
Sep. 30, 2023
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 services.
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, 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 supplying transmission and distribution 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, as well as costs associated with the announced strategic initiatives. Also included are certain general and administrative costs (reflected in operation and maintenance expense) and interest expense, which were previously allocated to the refining business, Fidelity and Knife River which do not meet the criteria for income (loss) from discontinued operations.
Discontinued operations includes Knife River's operations, strategic initiative costs and interest on debt facilities repaid in connection with the Knife River separation. For the comparative periods below, Knife River's operations are only reflected through May 2023, whereas 2022 includes the full three and nine months from Knife River's operations. Discontinued operations also includes 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 2022 Annual Report. Information on the Company's segments was as follows:
Three Months EndedNine Months Ended
September 30,September 30,
 2023 2022 2023 2022 
 (In thousands)
External operating revenues:   
Regulated operations:
Electric$108,089 $99,283 $294,775 $278,518 
Natural gas distribution134,896 132,145 919,487 793,142 
Pipeline36,549 32,346 79,697 69,347 
 279,534 263,774 1,293,959 1,141,007 
Non-regulated operations:
Pipeline3,855 3,712 9,389 7,650 
Construction services717,406 735,001 2,218,672 1,970,694 
Other— — — — 
 721,261 738,713 2,228,061 1,978,344 
Total external operating revenues$1,000,795 $1,002,487 $3,522,020 $3,119,351 
Intersegment operating revenues:    
Regulated operations:
Electric$27 $34 $82 $102 
Natural gas distribution69 69 208 206 
Pipeline3,666 3,508 37,624 36,845 
3,762 3,611 37,914 37,153 
Non-regulated operations:
Pipeline35 73 265 464 
Construction services— 2,037 — 4,391 
Other1,689 1,472 6,412 4,368 
1,724 3,582 6,677 9,223 
Total intersegment operating revenues$5,486 $7,193 $44,591 $46,376 
Operating income (loss):
Electric$28,718 $30,395 $71,372 $53,764 
Natural gas distribution(15,258)(16,688)45,674 38,929 
Pipeline17,767 14,963 44,693 39,448 
Construction services50,091 34,949 139,619 110,588 
Other3,286 (2,617)(16,201)(11,726)
Total operating income$84,604 $61,002 $285,157 $231,003 
Income (loss) from continuing operations:
Regulated operations:
Electric$20,942 $21,596 $53,887 $37,476 
Natural gas distribution(17,764)(18,058)18,007 10,758 
Pipeline11,450 9,381 29,029 25,015 
14,628 12,919 100,923 73,249 
Non-regulated operations:
Pipeline508 779 337 (179)
Construction services35,975 29,248 105,951 86,596 
Other27,107 (577)102,515 (12,769)
63,590 29,450 208,803 73,648 
Income from continuing operations78,218 42,369 309,726 146,897 
Discontinued operations, net of tax(3,289)105,602 (65,752)103,504 
Net income$74,929 $147,971 $243,974 $250,401 
A reconciliation of reportable segment operating revenues to consolidated operating revenues is as follows:
Three Months EndedNine Months Ended
September 30,September 30,
2023 2022 2023 2022 
(In thousands)
Operating revenues reconciliation:
Total reportable segment operating revenues$1,004,592 $1,008,208 $3,560,199 $3,161,359 
Other revenue1,689 1,472 6,412 4,368 
Elimination of intersegment operating revenues(5,486)(7,193)(44,591)(46,376)
Total consolidated operating revenues$1,000,795 $1,002,487 $3,522,020 $3,119,351