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Goodwill and other intangible assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in the carrying amount of goodwill | The changes in the carrying amount of goodwill for the year ended December 31, 2017, were as follows:
| Balance at January 1, 2017 |  |  | Goodwill Acquired During the Year |  |  | Balance at December 31, 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 |
The changes in the carrying amount of goodwill for the year ended December 31, 2016, were as follows:
| Balance at January 1, 2016 |  | * | Goodwill Acquired During the Year |  |  | Less 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 at December 31 were as follows:
| 2017 |  | 2016 |
| (In thousands)
Customer relationships | $ | 15,248 |  | $ | 17,145 |
Less accumulated amortization | 13,382 |  | 13,917 |
| 1,866 |  | 3,228 |
Noncompete agreements | 2,430 |  | 2,430 |
Less accumulated amortization | 1,805 |  | 1,658 |
| 625 |  | 772 |
Other | 6,990 |  | 7,768 |
Less accumulated amortization | 5,644 |  | 5,843 |
| 1,346 |  | 1,925 |
Total | $ | 3,837 |  | $ | 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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