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Business segment data | 12 Months Ended
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Dec. 31, 2017
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 and midstream 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. For information on the Company's natural gas and oil gathering and processing facility sold on January 1, 2017, see Note 2. The construction materials and contracting segment operations mine, process and sell construction aggregates (crushed stone, sand and gravel); produce and sell asphalt mix; and supply ready-mixed concrete. This segment focuses on vertical integration of construction services 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 and Alaska and Hawaii. The construction services segment provides inside and outside specialty contracting 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. Its inside services include design, construction and maintenance of electrical and communication wiring and infrastructure, fire suppression systems, and mechanical piping and services. This business also designs, 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 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 deductible self-insured layers of the insured companies' general liability, automobile liability, pollution liability and other coverages. Centennial Capital also owns certain real and personal property. The Other category also includes 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 includes the results and supporting activities of Dakota Prairie Refining and Fidelity other than certain general and administrative costs and interest expense as described above. Dakota Prairie Refining refined crude oil and produced and sold diesel fuel, naphtha, ATBs and other by-products of the production process. In the second quarter of 2016, the Company sold all of the outstanding membership interests in Dakota Prairie Refining. Fidelity engaged in oil and natural gas development and production activities in the Rocky Mountain and Mid-Continent/Gulf States regions of the United States. Between September 2015 and March 2016, the Company entered into purchase and sale agreements to sell substantially all of Fidelity's oil and natural gas assets. The completion of these sales occurred between October 2015 and April 2016. For more information on discontinued operations, see Note 2. The information below follows the same accounting policies as described in Note 1. Information on the Company's segments as of December 31 and for the years then ended was as follows:
| 2017 |  | 2016 |  | 2015 |
|  | (In thousands) |  |
External operating revenues: |  |  |
Regulated operations: |  |  |
Electric | $ | 342,805 |  | $ | 322,356 |  | $ | 280,615 |
Natural gas distribution | 848,388 |  | 766,115 |  | 817,419 |
Pipeline and midstream | 53,566 |  | 52,983 |  | 51,004 |
| 1,244,759 |  | 1,141,454 |  | 1,149,038 |
Nonregulated operations: |  |  |
Pipeline and midstream | 19,602 |  | 39,602 |  | 54,281 |
Construction materials and contracting | 1,811,964 |  | 1,873,696 |  | 1,901,530 |
Construction services | 1,366,317 |  | 1,072,663 |  | 907,767 |
Other | 709 |  | 1,413 |  | 1,436 |
| 3,198,592 |  | 2,987,374 |  | 2,865,014 |
Total external operating revenues | $ | 4,443,351 |  | $ | 4,128,828 |  | $ | 4,014,052 |
Intersegment operating revenues: |  |  |  |  |  |
Regulated operations: |  |  |
Electric | $ | — |  | $ | — |  | $ | — |
Natural gas distribution | — |  | — |  | — |
Pipeline and midstream | 48,867 |  | 48,794 |  | 49,065 |
| 48,867 |  | 48,794 |  | 49,065 |
Nonregulated operations: |  |  |
Pipeline and midstream | 178 |  | 223 |  | 554 |
Construction materials and contracting | 565 |  | 574 |  | 2,752 |
Construction services | 1,285 |  | 609 |  | 18,660 |
Other | 7,165 |  | 7,230 |  | 7,755 |
| 9,193 |  | 8,636 |  | 29,721 |
Intersegment eliminations | (58,060 | ) | (57,430 | ) | (78,786 | )
Total intersegment operating revenues | $ | — |  | $ | — |  | $ | — |
Depreciation, depletion and amortization: |  |  |  |  |  |
Electric | $ | 47,715 |  | $ | 50,220 |  | $ | 37,583 |
Natural gas distribution | 69,381 |  | 65,426 |  | 64,756 |
Pipeline and midstream | 16,788 |  | 24,885 |  | 27,981 |
Construction materials and contracting | 55,862 |  | 58,413 |  | 65,937 |
Construction services | 15,739 |  | 15,307 |  | 13,420 |
Other | 2,001 |  | 2,067 |  | 2,070 |
Total depreciation, depletion and amortization | $ | 207,486 |  | $ | 216,318 |  | $ | 211,747 |
Interest expense: |  |  |  |  |  |
Electric | $ | 25,377 |  | $ | 24,982 |  | $ | 17,421 |
Natural gas distribution | 31,234 |  | 30,405 |  | 29,471 |
Pipeline and midstream | 4,990 |  | 7,903 |  | 9,895 |
Construction materials and contracting | 14,778 |  | 15,265 |  | 15,183 |
Construction services | 3,742 |  | 4,059 |  | 3,959 |
Other | 3,564 |  | 5,854 |  | 15,853 |
Intersegment eliminations | (897 | ) | (620 | ) | (603 | )
Total interest expense | $ | 82,788 |  | $ | 87,848 |  | $ | 91,179 |
| 2017 |  | 2016 |  | 2015 |
|  | (In thousands) |  |
Income taxes: |  |  |  |  |  |
Electric | $ | 7,699 |  | $ | 1,449 |  | $ | 11,523 |
Natural gas distribution | 22,756 |  | 9,181 |  | 11,377 |
Pipeline and midstream | 12,281 |  | 12,408 |  | 7,505 |
Construction materials and contracting | 5,405 |  | 60,625 |  | 41,619 |
Construction services | 25,558 |  | 17,748 |  | 16,432 |
Other | (1,809 | ) | (2,028 | ) | (9,834 | )
Intersegment eliminations | (6,849 | ) | (6,251 | ) | (7,958 | )
Total income taxes | $ | 65,041 |  | $ | 93,132 |  | $ | 70,664 |
Earnings (loss) on common stock: |  |  |  |  |  |
Regulated operations: |  |  |
Electric | $ | 49,366 |  | $ | 42,222 |  | $ | 35,914 |
Natural gas distribution | 32,225 |  | 27,102 |  | 23,607 |
Pipeline and midstream | 20,620 |  | 22,060 |  | 20,680 |
| 102,211 |  | 91,384 |  | 80,201 |
Nonregulated operations: |  |  |
Pipeline and midstream | (127 | ) | 1,375 |  | (7,430 | )
Construction materials and contracting | 123,398 |  | 102,687 |  | 89,096 |
Construction services | 53,306 |  | 33,945 |  | 23,762 |
Other | (1,422 | ) | (3,231 | ) | (14,941 | )
| 175,155 |  | 134,776 |  | 90,487 |
Intersegment eliminations (a) | 6,849 |  | 6,251 |  | 5,016 |
Earnings on common stock before loss from discontinued operations | 284,215 |  | 232,411 |  | 175,704 |
Loss from discontinued operations, net of tax (a) | (3,783 | ) | (300,354 | ) | (834,080 | )
Loss from discontinued operations attributable to noncontrolling interest | — |  | (131,691 | ) | (35,256 | )
Total earnings (loss) on common stock | $ | 280,432 |  | $ | 63,748 |  | $ | (623,120 | )
Capital expenditures: |  |  |  |  |  |
Electric | $ | 109,107 |  | $ | 111,134 |  | $ | 332,876 |
Natural gas distribution | 146,981 |  | 126,272 |  | 130,793 |
Pipeline and midstream | 31,054 |  | 34,467 |  | 18,315 |
Construction materials and contracting | 44,302 |  | 37,845 |  | 48,126 |
Construction services | 18,630 |  | 60,344 |  | 38,269 |
Other | 1,850 |  | 2,358 |  | 3,755 |
Total capital expenditures (b) | $ | 351,924 |  | $ | 372,420 |  | $ | 572,134 |
Assets: |  |  |  |  |  |
Electric (c) | $ | 1,470,922 |  | $ | 1,406,694 |  | $ | 1,325,858 |
Natural gas distribution (c) | 2,201,081 |  | 2,099,296 |  | 2,038,433 |
Pipeline and midstream | 566,295 |  | 550,615 |  | 591,651 |
Construction materials and contracting | 1,238,696 |  | 1,220,459 |  | 1,261,963 |
Construction services | 591,382 |  | 513,093 |  | 442,845 |
Other (d) | 261,419 |  | 283,255 |  | 287,940 |
Assets held for sale | 4,871 |  | 211,055 |  | 616,464 |
Total assets | $ | 6,334,666 |  | $ | 6,284,467 |  | $ | 6,565,154 |
| 2017 |  | 2016 |  | 2015 |
|  | (In thousands) |  |
Property, plant and equipment: |  |  |  |  |  |
Electric (c) | $ | 1,982,264 |  | $ | 1,888,613 |  | $ | 1,786,148 |
Natural gas distribution (c) | 2,319,845 |  | 2,179,413 |  | 2,076,581 |
Pipeline and midstream | 700,284 |  | 672,199 |  | 758,729 |
Construction materials and contracting | 1,560,048 |  | 1,549,375 |  | 1,553,428 |
Construction services | 177,265 |  | 171,361 |  | 163,279 |
Other | 31,123 |  | 49,268 |  | 49,537 |
Less accumulated depreciation, depletion and amortization | 2,691,641 |  | 2,578,902 |  | 2,489,322 |
Net property, plant and equipment | $ | 4,079,188 |  | $ | 3,931,327 |  | $ | 3,898,380 |
(a) | Includes eliminations for the presentation of income tax adjustments between continuing and discontinued operations.
(b) | Capital expenditures for 2017, 2016 and 2015 include noncash capital expenditure-related accounts payable and AFUDC, totaling $10.5 million, $(15.8) million and $35.3 million, respectively.
(c) | Includes allocations of common utility property.
(d) | Includes assets not directly assignable to a business (i.e. cash and cash equivalents, certain accounts receivable, certain investments and other miscellaneous current and deferred assets).

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI http://asc.fasb.org/topic&trid=2134510 + Details
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