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Business segment data (Tables) | 9 Months Ended
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Sep. 30, 2017
Segment Reporting [Abstract] |
Information on the Company's businesses | Information on the Company's businesses was as follows:
| Three Months Ended | Nine Months Ended
| September 30, | September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016 |
| (In thousands)
External operating revenues: |  |  |  |
Regulated operations: |  |  |  |
Electric | $ | 91,531 |  | $ | 82,156 |  | $ | 254,330 |  | $ | 238,911 |
Natural gas distribution | 92,253 |  | 87,941 |  | 566,364 |  | 500,106 |
Pipeline and midstream | 23,152 |  | 21,982 |  | 45,341 |  | 44,980 |
| 206,936 |  | 192,079 |  | 866,035 |  | 783,997 |
Nonregulated operations: |  |  |  |
Pipeline and midstream | 5,356 |  | 10,732 |  | 13,518 |  | 29,697 |
Construction materials and contracting | 686,010 |  | 724,535 |  | 1,388,212 |  | 1,475,643 |
Construction services | 374,111 |  | 280,801 |  | 1,009,693 |  | 822,226 |
Other | 135 |  | 420 |  | 654 |  | 1,167 |
| 1,065,612 |  | 1,016,488 |  | 2,412,077 |  | 2,328,733 |
Total external operating revenues | $ | 1,272,548 |  | $ | 1,208,567 |  | $ | 3,278,112 |  | $ | 3,112,730 |
Intersegment operating revenues: |  |  |  |  |  |  |  |
Regulated operations: |  |  |  |
Electric | $ | — |  | $ | — |  | $ | — |  | $ | — |
Natural gas distribution | — |  | — |  | — |  | — |
Pipeline and midstream | 3,081 |  | 3,278 |  | 30,923 |  | 30,969 |
| 3,081 |  | 3,278 |  | 30,923 |  | 30,969 |
Nonregulated operations: |  |  |  |
Pipeline and midstream | 38 |  | 41 |  | 132 |  | 161 |
Construction materials and contracting | 142 |  | 155 |  | 400 |  | 370 |
Construction services | 415 |  | 3 |  | 715 |  | 541 |
Other | 1,910 |  | 2,204 |  | 5,411 |  | 5,542 |
| 2,505 |  | 2,403 |  | 6,658 |  | 6,614 |
Intersegment eliminations | (5,586 | ) | (5,681 | ) | (37,581 | ) | (37,583 | )
Total intersegment operating revenues | $ | — |  | $ | — |  | $ | — |  | $ | — |
| Three Months Ended | Nine Months Ended
| September 30, | September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016 |
| (In thousands)
Earnings (loss) on common stock: |  |  |  |  |  |  |  |
Regulated operations: |  |  |  |
Electric | $ | 15,712 |  | $ | 12,699 |  | $ | 37,904 |  | $ | 31,840 |
Natural gas distribution | (10,883 | ) | (12,524 | ) | 14,181 |  | 4,940 |
Pipeline and midstream | 5,853 |  | 5,389 |  | 15,901 |  | 16,241 |
| 10,682 |  | 5,564 |  | 67,986 |  | 53,021 |
Nonregulated operations: |  |  |  |
Pipeline and midstream | 95 |  | 1,304 |  | (770 | ) | 2,043 |
Construction materials and contracting | 63,221 |  | 69,523 |  | 64,477 |  | 88,747 |
Construction services | 13,144 |  | 7,234 |  | 32,896 |  | 20,198 |
Other | 552 |  | (1,009 | ) | (1,888 | ) | (3,572 | )
| 77,012 |  | 77,052 |  | 94,715 |  | 107,416 |
Intersegment eliminations* | 1,855 |  | 5,599 |  | 6,121 |  | 5,599 |
Earnings on common stock before loss from discontinued operations | 89,549 |  | 88,215 |  | 168,822 |  | 166,036 |
Loss from discontinued operations, net of tax* | (2,198 | ) | (5,400 | ) | (3,702 | ) | (299,538 | )
Loss from discontinued operations attributable to noncontrolling interest | — |  | — |  | — |  | (131,691 | )
Total earnings (loss) on common stock | $ | 87,351 |  | $ | 82,815 |  | $ | 165,120 |  | $ | (1,811 | )
* Includes eliminations for the presentation of income tax adjustments between continuing and discontinued operations.

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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 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 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=68060357&loc=d3e8813-108599 Reference 3: 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=68060357&loc=d3e8721-108599 Reference 4: 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=35741047&loc=d3e13816-109267 Reference 5: 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=68060357&loc=d3e8736-108599 + Details
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