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Goodwill and other intangible assets (Tables) | 3 Months Ended
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Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in the carrying amount of goodwill | The changes in the carrying amount of goodwill were as follows:
Three Months Ended March 31, 2018 | Balance at January 1, 2018 |  | Goodwill Acquired During the Year |  | Balance at March 31, 2018 |
| (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 |
Three Months Ended March 31, 2017 | Balance at January 1, 2017 |  | Goodwill Acquired During the Year |  | Balance at March 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 |
Year Ended December 31, 2017 | 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 |
Other amortizable intangible assets | Other amortizable intangible assets were as follows:
| March 31, 2018 |  | March 31, 2017 |  | December 31, 2017 |
| (In thousands)
Customer relationships | $ | 14,668 |  | $ | 15,745 |  | $ | 15,248 |
Less accumulated amortization | 13,007 |  | 12,910 |  | 13,382 |
| 1,661 |  | 2,835 |  | 1,866 |
Noncompete agreements | 2,430 |  | 2,430 |  | 2,430 |
Less accumulated amortization | 1,842 |  | 1,695 |  | 1,805 |
| 588 |  | 735 |  | 625 |
Other | 6,458 |  | 7,086 |  | 6,990 |
Less accumulated amortization | 5,242 |  | 5,309 |  | 5,644 |
| 1,216 |  | 1,777 |  | 1,346 |
Total | $ | 3,465 |  | $ | 5,347 |  | $ | 3,837 |

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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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