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Goodwill and other intangible assets (Tables) | 9 Months Ended
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Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in the carrying amount of goodwill | The changes in the carrying amount of goodwill were as follows:
Nine Months Ended September 30, 2017 | Balance at January 1, 2017 |  | Goodwill Acquired During the Year |  | Balance at September 30, 2017 |
| (In thousands)
Natural gas distribution | $ | 345,736 |  | $ | — |  | $ | 345,736 |
Construction materials and contracting | 176,290 |  | — |  | 176,290 |
Construction services | 109,765 |  | — |  | 109,765 |
Total | $ | 631,791 |  | $ | — |  | $ | 631,791 |
Nine Months Ended September 30, 2016 | Balance at January 1, 2016 |  | * | Goodwill Acquired During the Year |  | Balance at September 30, 2016 |  | *
| (In thousands)
Natural gas distribution | $ | 345,736 |  |  | $ | — |  | $ | 345,736 |  |
Pipeline and midstream | 9,737 |  |  | — |  | 9,737 |  |
Construction materials and contracting | 176,290 |  |  | — |  | 176,290 |  |
Construction services | 103,441 |  |  | 6,323 |  | 109,764 |  |
Total | $ | 635,204 |  |  | $ | 6,323 |  | $ | 641,527 |  |
* Balance is presented net of accumulated impairment of $12.3 million at the pipeline and midstream segment, which occurred in prior periods.
Year Ended December 31, 2016 | Balance at January 1, 2016 |  | * | Goodwill Acquired During the Year |  | Held for Sale |  | Balance at December 31, 2016 |
| (In thousands)
Natural gas distribution | $ | 345,736 |  |  | $ | — |  | $ | — |  | $ | 345,736 |
Pipeline and midstream | 9,737 |  |  | — |  | (9,737 | ) | — |
Construction materials and contracting | 176,290 |  |  | — |  | — |  | 176,290 |
Construction services | 103,441 |  |  | 6,324 |  | — |  | 109,765 |
Total | $ | 635,204 |  |  | $ | 6,324 |  | $ | (9,737 | ) | $ | 631,791 |
* Balance is presented net of accumulated impairment of $12.3 million at the pipeline and midstream segment, which occurred in prior periods.
Other amortizable intangible assets | Other amortizable intangible assets were as follows:
| September 30, 2017 |  | September 30, 2016 |  | December 31, 2016 |
| (In thousands)
Customer relationships | $ | 15,248 |  | $ | 17,145 |  | $ | 17,145 |
Less accumulated amortization | 13,176 |  | 13,524 |  | 13,917 |
| 2,072 |  | 3,621 |  | 3,228 |
Noncompete agreements | 2,430 |  | 2,430 |  | 2,430 |
Less accumulated amortization | 1,769 |  | 1,622 |  | 1,658 |
| 661 |  | 808 |  | 772 |
Other | 7,020 |  | 7,764 |  | 7,768 |
Less accumulated amortization | 5,544 |  | 5,664 |  | 5,843 |
| 1,476 |  | 2,100 |  | 1,925 |
Total | $ | 4,209 |  | $ | 6,529 |  | $ | 5,925 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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