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Business segment data (Tables) | 12 Months Ended
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Dec. 31, 2012
Segment Reporting [Abstract] |
Information on the Company's businesses | 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.

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27, 28 -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 5: 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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8721-108599 + Details
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