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Business segment data | 12 Months Ended
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Dec. 31, 2012
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 and other management. The vast majority of the Company's operations are located within the United States. The Company also has an investment in a foreign country, which consists of Centennial Resources' equity method investment in ECTE. 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 energy services segment provides natural gas transportation, underground storage, processing and gathering services, as well as oil gathering, 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 exploration and production segment is engaged in oil and natural gas acquisition, exploration, development and production activities in the Rocky Mountain and Mid-Continent regions of the United States and in and around the Gulf of Mexico. 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 specializes in constructing and maintaining electric and communication lines, gas pipelines, fire suppression systems, and external lighting and traffic signalization equipment. This segment also provides utility excavation services and inside electrical wiring, cabling and mechanical services, sells and distributes electrical materials, and manufactures and distributes specialty equipment. 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 and automobile liability coverages. Centennial Capital also owns certain real and personal property. The Other category also includes Centennial Resources' equity method investment in ECTE. 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:
| 2012 |  | 2011 |  | 2010 |
| (In thousands)
External operating revenues: |  |  |
Electric | $ | 236,895 |  | $ | 225,468 |  | $ | 211,544 |
Natural gas distribution | 754,848 |  | 907,400 |  | 892,708 |
Pipeline and energy services | 139,883 |  | 210,846 |  | 254,776 |
| 1,131,626 |  | 1,343,714 |  | 1,359,028 |
Exploration and production | 412,651 |  | 359,873 |  | 318,570 |
Construction materials and contracting | 1,597,257 |  | 1,509,538 |  | 1,445,148 |
Construction services | 932,013 |  | 834,918 |  | 786,802 |
Other | 1,884 |  | 2,449 |  | 147 |
| 2,943,805 |  | 2,706,778 |  | 2,550,667 |
Total external operating revenues | $ | 4,075,431 |  | $ | 4,050,492 |  | $ | 3,909,695 |
Intersegment operating revenues: |  |  |  |  |  |
Electric | $ | — |  | $ | — |  | $ | — |
Natural gas distribution | — |  | — |  | — |
Pipeline and energy services | 53,274 |  | 67,497 |  | 75,033 |
Exploration and production | 35,966 |  | 93,713 |  | 115,784 |
Construction materials and contracting | 20,168 |  | 472 |  | — |
Construction services | 6,545 |  | 19,471 |  | 2,298 |
Other | 8,486 |  | 8,997 |  | 7,580 |
Intersegment eliminations | (124,439 | ) | (190,150 | ) | (200,695 | )
Total intersegment operating revenues | $ | — |  | $ | — |  | $ | — |
Depreciation, depletion and amortization: |  |  |  |  |  |
Electric | $ | 32,509 |  | $ | 32,177 |  | $ | 27,274 |
Natural gas distribution | 45,731 |  | 44,641 |  | 43,044 |
Pipeline and energy services | 27,684 |  | 25,502 |  | 26,001 |
Exploration and production | 160,681 |  | 142,645 |  | 130,455 |
Construction materials and contracting | 79,527 |  | 85,459 |  | 88,331 |
Construction services | 11,063 |  | 11,399 |  | 12,147 |
Other | 2,010 |  | 1,572 |  | 1,591 |
Total depreciation, depletion and amortization | $ | 359,205 |  | $ | 343,395 |  | $ | 328,843 |
| 2012 |  | 2011 |  | 2010 |
| (In thousands)
Interest expense: |  |  |  |  |  |
Electric | $ | 12,421 |  | $ | 13,745 |  | $ | 12,216 |
Natural gas distribution | 28,726 |  | 29,444 |  | 28,996 |
Pipeline and energy services | 7,742 |  | 10,516 |  | 9,064 |
Exploration and production | 9,018 |  | 7,445 |  | 8,580 |
Construction materials and contracting | 15,211 |  | 16,241 |  | 19,859 |
Construction services | 4,435 |  | 4,473 |  | 4,411 |
Other | 13 |  | — |  | 47 |
Intersegment eliminations | (867 | ) | (510 | ) | (162 | )
Total interest expense | $ | 76,699 |  | $ | 81,354 |  | $ | 83,011 |
Income taxes: |  |  |  |  |  |
Electric | $ | 8,975 |  | $ | 7,242 |  | $ | 11,187 |
Natural gas distribution | 12,005 |  | 16,931 |  | 12,171 |
Pipeline and energy services | 15,291 |  | 12,912 |  | 13,933 |
Exploration and production | (108,264 | ) | 46,298 |  | 49,034 |
Construction materials and contracting | 14,099 |  | 11,227 |  | 13,822 |
Construction services | 24,128 |  | 13,426 |  | 11,456 |
Other | 2,620 |  | 2,238 |  | 10,927 |
Total income taxes | $ | (31,146 | ) | $ | 110,274 |  | $ | 122,530 |
Earnings (loss) on common stock: |  |  |  |  |  |
Electric | $ | 30,634 |  | $ | 29,258 |  | $ | 28,908 |
Natural gas distribution | 29,409 |  | 38,398 |  | 36,944 |
Pipeline and energy services | 26,588 |  | 23,082 |  | 23,208 |
Exploration and production | (177,283 | ) | 80,282 |  | 85,638 |
Construction materials and contracting | 32,420 |  | 26,430 |  | 29,609 |
Construction services | 38,429 |  | 21,627 |  | 17,982 |
Other | 4,797 |  | 6,190 |  | 21,046 |
Earnings (loss) on common stock before income (loss) from discontinued operations | (15,006 | ) | 225,267 |  | 243,335 |
Income (loss) from discontinued operations, net of tax* | 13,567 |  | (12,926 | ) | (3,361 | )
Total earnings (loss) on common stock | $ | (1,439 | ) | $ | 212,341 |  | $ | 239,974 |
Capital expenditures: |  |  |  |  |  |
Electric | $ | 112,035 |  | $ | 52,072 |  | $ | 85,787 |
Natural gas distribution | 130,178 |  | 70,624 |  | 75,365 |
Pipeline and energy services | 133,787 |  | 45,556 |  | 14,255 |
Exploration and production | 554,528 |  | 272,855 |  | 355,845 |
Construction materials and contracting | 45,083 |  | 52,303 |  | 25,724 |
Construction services | 14,835 |  | 9,711 |  | 14,849 |
Other | 791 |  | 18,759 |  | 2,182 |
Net proceeds from sale or disposition of property and other | (57,460 | ) | (40,857 | ) | (78,761 | )
Total net capital expenditures | $ | 933,777 |  | $ | 481,023 |  | $ | 495,246 |
Assets: |  |  |  |  |  |
Electric** | $ | 760,324 |  | $ | 672,940 |  | $ | 643,636 |
Natural gas distribution** | 1,703,459 |  | 1,679,091 |  | 1,632,012 |
Pipeline and energy services | 622,470 |  | 526,797 |  | 523,075 |
Exploration and production | 1,539,017 |  | 1,481,556 |  | 1,342,808 |
Construction materials and contracting | 1,371,252 |  | 1,374,026 |  | 1,382,836 |
Construction services | 429,547 |  | 418,519 |  | 387,627 |
Other*** | 256,422 |  | 403,196 |  | 391,555 |
Total assets | $ | 6,682,491 |  | $ | 6,556,125 |  | $ | 6,303,549 |
| 2012 |  | 2011 |  | 2010 |
| (In thousands)
Property, plant and equipment: |  |  |  |  |  |
Electric** | $ | 1,150,584 |  | $ | 1,068,524 |  | $ | 1,027,034 |
Natural gas distribution** | 1,689,950 |  | 1,568,866 |  | 1,508,845 |
Pipeline and energy services | 816,533 |  | 719,291 |  | 683,807 |
Exploration and production | 2,764,560 |  | 2,615,146 |  | 2,356,938 |
Construction materials and contracting | 1,504,981 |  | 1,499,852 |  | 1,486,375 |
Construction services | 130,624 |  | 124,796 |  | 122,940 |
Other | 50,519 |  | 49,747 |  | 32,564 |
Less accumulated depreciation, depletion and amortization | 3,608,912 |  | 3,361,208 |  | 3,103,323 |
Net property, plant and equipment | $ | 4,498,839 |  | $ | 4,285,014 |  | $ | 4,115,180 |
* Reflected in the Other category. ** Includes allocations of common utility property. *** 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). Note: The results reflect $391.8 million ($246.8 million after tax) of noncash write-downs of oil and natural gas properties in 2012. Excluding the natural gas gathering arbitration charge of $16.5 million (after tax) in 2010, and the reversal of this arbitration charge of $15.0 million (after tax) in 2012, as discussed in Note 19, earnings from electric, natural gas distribution and pipeline and energy services are substantially all from regulated operations. Earnings from exploration and production, construction materials and contracting, construction services and other are all from nonregulated operations. Capital expenditures for 2012, 2011 and 2010 include noncash transactions, including capital expenditure-related accounts payable. The net noncash transactions were $33.7 million in 2012, $24.0 million in 2011 and $17.5 million in 2010.

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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 29 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8864-108599 Reference 2: 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=6534315&loc=d3e8906-108599 Reference 3: 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=6534315&loc=d3e8933-108599 Reference 4: 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=6534315&loc=d3e8984-108599 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=6534315&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 10 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8538-108599 Reference 7: 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=6534315&loc=d3e9054-108599 Reference 8: 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=6534315&loc=d3e8595-108599 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 10: 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=6534315&loc=d3e8981-108599 Reference 11: 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=6534315&loc=d3e8971-108599 Reference 12: 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=6534315&loc=d3e8844-108599 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=6534315&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 40 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9031-108599 Reference 15: 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=6534315&loc=d3e9038-108599 + Details
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