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Goodwill and other intangible assets (Tables) | 12 Months Ended
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Dec. 31, 2018
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, 2018, were as follows:
| Balance at January 1, 2018 |  |  | Goodwill Acquired During the Year |  |  | Balance at December 31, 2018 |
| (In thousands)
Natural gas distribution | $ | 345,736 |  |  | $ | — |  |  | $ | 345,736 |
Construction materials and contracting | 176,290 |  |  | 33,131 |  |  | 209,421 |
Construction services | 109,765 |  |  | — |  |  | 109,765 |
Total | $ | 631,791 |  |  | $ | 33,131 |  |  | $ | 664,922 |
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 |
Other amortizable intangible assets | Other amortizable intangible assets at December 31 were as follows:
| 2018 |  | 2017 |
| (In thousands)
Customer relationships | $ | 22,720 |  | $ | 15,248 |
Less accumulated amortization | 13,535 |  | 13,382 |
| 9,185 |  | 1,866 |
Noncompete agreements | 2,605 |  | 2,430 |
Less accumulated amortization | 1,956 |  | 1,805 |
| 649 |  | 625 |
Other | 6,458 |  | 6,990 |
Less accumulated amortization | 5,477 |  | 5,644 |
| 981 |  | 1,346 |
Total | $ | 10,815 |  | $ | 3,837 |
Future Amortization Expense | The amounts of estimated amortization expense for identifiable intangible assets as of December 31, 2018, were:
| 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 |  | Thereafter |
| (In thousands)
Amortization expense | $ | 1,856 |  | $ | 1,486 |  | $ | 1,096 |  | $ | 1,072 |  | $ | 1,006 |  | $ | 4,299 |

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