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Business segment data | 12 Months Ended
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Dec. 31, 2016
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, gathering and processing services, as well as oil gathering, through regulated and nonregulated pipeline systems and processing facilities 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 aggregates and markets crushed stone, sand, gravel and related construction materials, including ready-mixed concrete, cement, asphalt, liquid asphalt and other value-added products. It also performs integrated contracting services. This segment operates in the central, southern and western United States and Alaska and Hawaii. The construction services segment provides utility construction services specializing in constructing and maintaining electric and communication lines, gas pipelines, fire suppression systems, and external lighting and traffic signalization. This segment also provides utility excavation and inside electrical and mechanical services, and manufactures and distributes transmission line construction equipment and other supplies. 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 layers of the insured companies' general liability, automobile liability and pollution liability 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 the Brazilian Transmission Lines. Discontinued operations includes the results 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 all of Fidelity's oil and natural gas assets. The completion of these sales occurred between October 2015 and April 2016. Discontinued operations also includes legal expenses and a benefit related to the vacation of an arbitration award in 2014 related to Centennial Resources. For more information on discontinued operations, see Note 2. The information below follows the same accounting policies as described in the Summary of Significant Accounting Policies. Information on the Company's businesses as of December 31 and for the years then ended was as follows:
| 2016 |  | 2015 |  | 2014 |
|  | (In thousands) |  |
External operating revenues: |  |  |
Regulated operations: |  |  |
Electric | $ | 322,356 |  | $ | 280,615 |  | $ | 277,874 |
Natural gas distribution | 766,115 |  | 817,419 |  | 921,986 |
Pipeline and midstream | 52,983 |  | 51,004 |  | 47,043 |
| 1,141,454 |  | 1,149,038 |  | 1,246,903 |
Nonregulated operations: |  |  |
Pipeline and midstream | 39,602 |  | 54,281 |  | 64,494 |
Construction materials and contracting | 1,873,696 |  | 1,901,530 |  | 1,740,089 |
Construction services | 1,072,663 |  | 907,767 |  | 1,062,055 |
Other | 1,413 |  | 1,436 |  | 1,532 |
| 2,987,374 |  | 2,865,014 |  | 2,868,170 |
Total external operating revenues | $ | 4,128,828 |  | $ | 4,014,052 |  | $ | 4,115,073 |
Intersegment operating revenues: |  |  |  |  |  |
Regulated operations: |  |  |
Electric | $ | — |  | $ | — |  | $ | — |
Natural gas distribution | — |  | — |  | — |
Pipeline and midstream | 48,794 |  | 49,065 |  | 45,013 |
| 48,794 |  | 49,065 |  | 45,013 |
Nonregulated operations: |  |  |
Pipeline and midstream | 223 |  | 554 |  | 742 |
Construction materials and contracting | 574 |  | 2,752 |  | 25,241 |
Construction services | 609 |  | 18,660 |  | 57,474 |
Other | 7,230 |  | 7,755 |  | 7,832 |
| 8,636 |  | 29,721 |  | 91,289 |
Intersegment eliminations | (57,430 | ) | (78,786 | ) | (136,302 | )
Total intersegment operating revenues | $ | — |  | $ | — |  | $ | — |
Depreciation, depletion and amortization: |  |  |  |  |  |
Electric | $ | 50,220 |  | $ | 37,583 |  | $ | 35,008 |
Natural gas distribution | 65,426 |  | 64,756 |  | 54,700 |
Pipeline and midstream | 24,885 |  | 27,981 |  | 29,749 |
Construction materials and contracting | 58,413 |  | 65,937 |  | 68,557 |
Construction services | 15,307 |  | 13,420 |  | 12,874 |
Other | 2,067 |  | 2,070 |  | 2,196 |
Total depreciation, depletion and amortization | $ | 216,318 |  | $ | 211,747 |  | $ | 203,084 |
Interest expense: |  |  |  |  |  |
Electric | $ | 24,982 |  | $ | 17,421 |  | $ | 15,595 |
Natural gas distribution | 30,405 |  | 29,471 |  | 27,217 |
Pipeline and midstream | 7,903 |  | 9,895 |  | 9,946 |
Construction materials and contracting | 15,265 |  | 15,183 |  | 16,368 |
Construction services | 4,059 |  | 3,959 |  | 4,176 |
Other | 5,854 |  | 15,853 |  | 13,823 |
Intersegment eliminations | (620 | ) | (603 | ) | (254 | )
Total interest expense | $ | 87,848 |  | $ | 91,179 |  | $ | 86,871 |
| 2016 |  | 2015 |  | 2014 |
|  | (In thousands) |  |
Income taxes: |  |  |  |  |  |
Electric | $ | 1,449 |  | $ | 11,523 |  | $ | 12,442 |
Natural gas distribution | 9,181 |  | 11,377 |  | 11,350 |
Pipeline and midstream | 12,408 |  | 7,505 |  | 12,232 |
Construction materials and contracting | 60,625 |  | 41,619 |  | 18,586 |
Construction services | 17,748 |  | 16,432 |  | 24,753 |
Other | (2,028 | ) | (9,834 | ) | (11,136 | )
Intersegment eliminations | (6,251 | ) | (7,958 | ) | (3,805 | )
Total income taxes | $ | 93,132 |  | $ | 70,664 |  | $ | 64,422 |
Earnings (loss) on common stock: |  |  |  |  |  |
Regulated operations: |  |  |
Electric | $ | 42,222 |  | $ | 35,914 |  | $ | 36,731 |
Natural gas distribution | 27,102 |  | 23,607 |  | 30,484 |
Pipeline and midstream | 22,060 |  | 20,680 |  | 15,440 |
| 91,384 |  | 80,201 |  | 82,655 |
Nonregulated operations: |  |  |
Pipeline and midstream | 1,375 |  | (7,430 | ) | 9,226 |
Construction materials and contracting | 102,687 |  | 89,096 |  | 51,510 |
Construction services | 33,945 |  | 23,762 |  | 54,432 |
Other | (3,231 | ) | (14,941 | ) | (7,386 | )
| 134,776 |  | 90,487 |  | 107,782 |
Intersegment eliminations (a) | 6,251 |  | 5,016 |  | (6,095 | )
Earnings on common stock before income (loss) from discontinued operations | 232,411 |  | 175,704 |  | 184,342 |
Income (loss) from discontinued operations, net of tax (a) | (300,354 | ) | (834,080 | ) | 109,311 |
Loss from discontinued operations attributable to noncontrolling interest | (131,691 | ) | (35,256 | ) | (3,895 | )
Total earnings (loss) on common stock | $ | 63,748 |  | $ | (623,120 | ) | $ | 297,548 |
Capital expenditures: |  |  |  |  |  |
Electric | $ | 111,134 |  | $ | 332,876 |  | $ | 185,121 |
Natural gas distribution | 126,272 |  | 130,793 |  | 120,613 |
Pipeline and midstream | 34,467 |  | 18,315 |  | 61,754 |
Construction materials and contracting | 37,845 |  | 48,126 |  | 37,896 |
Construction services | 60,344 |  | 38,269 |  | 26,942 |
Other | 2,358 |  | 3,755 |  | 2,131 |
Total capital expenditures (b) | $ | 372,420 |  | $ | 572,134 |  | $ | 434,457 |
Assets: |  |  |  |  |  |
Electric (c) | $ | 1,406,694 |  | $ | 1,325,858 |  | $ | 1,028,001 |
Natural gas distribution (c) | 2,099,296 |  | 2,038,433 |  | 1,935,271 |
Pipeline and midstream | 550,615 |  | 591,651 |  | 651,925 |
Construction materials and contracting | 1,220,459 |  | 1,261,963 |  | 1,260,534 |
Construction services | 513,093 |  | 442,845 |  | 437,322 |
Other (d) | 283,255 |  | 287,940 |  | 315,495 |
Assets held for sale | 211,055 |  | 616,464 |  | 2,176,857 |
Total assets | $ | 6,284,467 |  | $ | 6,565,154 |  | $ | 7,805,405 |
| 2016 |  | 2015 |  | 2014 |
|  | (In thousands) |  |
Property, plant and equipment: |  |  |  |  |  |
Electric (c) | $ | 1,888,613 |  | $ | 1,786,148 |  | $ | 1,457,101 |
Natural gas distribution (c) | 2,179,413 |  | 2,076,581 |  | 1,904,759 |
Pipeline and midstream | 672,199 |  | 758,729 |  | 818,388 |
Construction materials and contracting | 1,549,375 |  | 1,553,428 |  | 1,529,942 |
Construction services | 171,361 |  | 163,279 |  | 144,395 |
Other | 49,268 |  | 49,537 |  | 50,937 |
Less accumulated depreciation, depletion and amortization | 2,578,902 |  | 2,489,322 |  | 2,385,202 |
Net property, plant and equipment | $ | 3,931,327 |  | $ | 3,898,380 |  | $ | 3,520,320 |
(a) | Includes eliminations for the presentation of income tax adjustments between continuing and discontinued operations.
(b) | Capital expenditures for 2016, 2015 and 2014 include noncash capital expenditure-related accounts payable and AFUDC, totaling $(15.8) million, $35.3 million and $5.1 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 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8981-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8971-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8595-108599 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8380-108599 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8933-108599 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8844-108599 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8984-108599 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9031-108599 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9054-108599 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8538-108599 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 29 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8864-108599 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8924-108599 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 + Details
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