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Business segment data (Tables) | 12 Months Ended
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Dec. 31, 2018
Segment Reporting [Abstract] |
Information on the Company's businesses | Information on the Company's segments as of December 31 and for the years then ended was as follows:
| 2018 |  | 2017 |  | 2016 |
|  | (In thousands) |  |
External operating revenues: |  |  |
Regulated operations: |  |  |
Electric | $ | 335,123 |  | $ | 342,805 |  | $ | 322,356 |
Natural gas distribution | 823,247 |  | 848,388 |  | 766,115 |
Pipeline and midstream | 54,857 |  | 53,566 |  | 52,983 |
| 1,213,227 |  | 1,244,759 |  | 1,141,454 |
Nonregulated operations: |  |  |
Pipeline and midstream | 23,161 |  | 19,602 |  | 39,602 |
Construction materials and contracting | 1,925,185 |  | 1,811,964 |  | 1,873,696 |
Construction services | 1,369,772 |  | 1,366,317 |  | 1,072,663 |
Other | 207 |  | 709 |  | 1,413 |
| 3,318,325 |  | 3,198,592 |  | 2,987,374 |
Total external operating revenues | $ | 4,531,552 |  | $ | 4,443,351 |  | $ | 4,128,828 |
Intersegment operating revenues: |  |  |  |  |  |
Regulated operations: |  |  |
Electric | $ | — |  | $ | — |  | $ | — |
Natural gas distribution | — |  | — |  | — |
Pipeline and midstream | 50,580 |  | 48,867 |  | 48,794 |
| 50,580 |  | 48,867 |  | 48,794 |
Nonregulated operations: |  |  |
Pipeline and midstream | 325 |  | 178 |  | 223 |
Construction materials and contracting | 669 |  | 565 |  | 574 |
Construction services | 1,681 |  | 1,285 |  | 609 |
Other | 11,052 |  | 7,165 |  | 7,230 |
| 13,727 |  | 9,193 |  | 8,636 |
Intersegment eliminations | (64,307 | ) | (58,060 | ) | (57,430 | )
Total intersegment operating revenues | $ | — |  | $ | — |  | $ | — |
Depreciation, depletion and amortization: |  |  |  |  |  |
Electric | $ | 50,982 |  | $ | 47,715 |  | $ | 50,220 |
Natural gas distribution | 72,486 |  | 69,381 |  | 65,426 |
Pipeline and midstream | 17,896 |  | 16,788 |  | 24,885 |
Construction materials and contracting | 61,158 |  | 55,862 |  | 58,413 |
Construction services | 15,728 |  | 15,739 |  | 15,307 |
Other | 1,955 |  | 2,001 |  | 2,067 |
Total depreciation, depletion and amortization | $ | 220,205 |  | $ | 207,486 |  | $ | 216,318 |
Operating income (loss): |  |  |
Electric | $ | 65,148 |  | $ | 79,902 |  | $ | 67,929 |
Natural gas distribution | 72,336 |  | 84,239 |  | 66,166 |
Pipeline and midstream | 36,128 |  | 36,004 |  | 42,864 |
Construction materials and contracting | 141,426 |  | 143,230 |  | 178,753 |
Construction services | 86,764 |  | 81,292 |  | 53,546 |
Other | (79 | ) | (619 | ) | (349 | )
Total operating income | $ | 401,723 |  | $ | 424,048 |  | $ | 408,909 |
| 2018 |  | 2017 |  | 2016 |
|  | (In thousands) |  |
Interest expense: |  |  |  |  |  |
Electric | $ | 25,860 |  | $ | 25,377 |  | $ | 24,982 |
Natural gas distribution | 30,768 |  | 31,234 |  | 30,405 |
Pipeline and midstream | 5,964 |  | 4,990 |  | 7,903 |
Construction materials and contracting | 17,290 |  | 14,778 |  | 15,265 |
Construction services | 3,551 |  | 3,742 |  | 4,059 |
Other | 2,762 |  | 3,564 |  | 5,854 |
Intersegment eliminations | (1,581 | ) | (897 | ) | (620 | )
Total interest expense | $ | 84,614 |  | $ | 82,788 |  | $ | 87,848 |
Income taxes: |  |  |  |  |  |
Electric | $ | (6,482 | ) | $ | 7,699 |  | $ | 1,449 |
Natural gas distribution | 4,075 |  | 22,756 |  | 9,181 |
Pipeline and midstream | 2,677 |  | 12,281 |  | 12,408 |
Construction materials and contracting | 28,357 |  | 5,405 |  | 60,625 |
Construction services | 20,000 |  | 25,558 |  | 17,748 |
Other | (1,142 | ) | (1,809 | ) | (2,028 | )
Intersegment eliminations | — |  | (6,849 | ) | (6,251 | )
Total income taxes | $ | 47,485 |  | $ | 65,041 |  | $ | 93,132 |
Earnings on common stock: |  |  |  |  |  |
Regulated operations: |  |  |
Electric | $ | 47,000 |  | $ | 49,366 |  | $ | 42,222 |
Natural gas distribution | 37,732 |  | 32,225 |  | 27,102 |
Pipeline and midstream | 26,905 |  | 20,620 |  | 22,060 |
| 111,637 |  | 102,211 |  | 91,384 |
Nonregulated operations: |  |  |
Pipeline and midstream | 1,554 |  | (127 | ) | 1,375 |
Construction materials and contracting | 92,647 |  | 123,398 |  | 102,687 |
Construction services | 64,309 |  | 53,306 |  | 33,945 |
Other | (761 | ) | (1,422 | ) | (3,231 | )
| 157,749 |  | 175,155 |  | 134,776 |
Intersegment eliminations (a) | — |  | 6,849 |  | 6,251 |
Earnings on common stock before income (loss) from discontinued operations | 269,386 |  | 284,215 |  | 232,411 |
Income (loss) from discontinued operations, net of tax (a) | 2,932 |  | (3,783 | ) | (300,354 | )
Loss from discontinued operations attributable to noncontrolling interest | — |  | — |  | (131,691 | )
Earnings on common stock | $ | 272,318 |  | $ | 280,432 |  | $ | 63,748 |
Capital expenditures: |  |  |  |  |  |
Electric | $ | 186,105 |  | $ | 109,107 |  | $ | 111,134 |
Natural gas distribution | 205,896 |  | 146,981 |  | 126,272 |
Pipeline and midstream | 70,057 |  | 31,054 |  | 34,467 |
Construction materials and contracting | 280,396 |  | 44,302 |  | 37,845 |
Construction services | 25,081 |  | 18,630 |  | 60,344 |
Other | 1,768 |  | 1,850 |  | 2,358 |
Total capital expenditures (b) | $ | 769,303 |  | $ | 351,924 |  | $ | 372,420 |
| 2018 |  | 2017 |  | 2016 |
|  | (In thousands) |  |
Assets: |  |  |  |  |  |
Electric (c) | $ | 1,613,822 |  | $ | 1,470,922 |  | $ | 1,406,694 |
Natural gas distribution (c) | 2,375,871 |  | 2,201,081 |  | 2,099,296 |
Pipeline and midstream | 616,959 |  | 566,295 |  | 550,615 |
Construction materials and contracting | 1,508,032 |  | 1,238,696 |  | 1,220,459 |
Construction services | 604,798 |  | 591,382 |  | 513,093 |
Other (d) | 266,111 |  | 261,419 |  | 283,255 |
Assets held for sale | 2,517 |  | 4,871 |  | 211,055 |
Total assets | $ | 6,988,110 |  | $ | 6,334,666 |  | $ | 6,284,467 |
Property, plant and equipment: |  |  |  |  |  |
Electric (c) | $ | 2,148,569 |  | $ | 1,982,264 |  | $ | 1,888,613 |
Natural gas distribution (c) | 2,499,093 |  | 2,319,845 |  | 2,179,413 |
Pipeline and midstream | 764,959 |  | 700,284 |  | 672,199 |
Construction materials and contracting | 1,768,006 |  | 1,560,048 |  | 1,549,375 |
Construction services | 188,586 |  | 177,265 |  | 171,361 |
Other | 28,108 |  | 31,123 |  | 49,268 |
Less accumulated depreciation, depletion and amortization | 2,818,644 |  | 2,691,641 |  | 2,578,902 |
Net property, plant and equipment | $ | 4,578,677 |  | $ | 4,079,188 |  | $ | 3,931,327 |
(a) | Includes eliminations for the presentation of income tax adjustments between continuing and discontinued operations.
(b) | $33.4 million, $10.5 million and $(15.8) 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 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8721-108599 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8906-108599 + Details
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