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Goodwill and other intangible assets (Tables) | 3 Months Ended
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Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in the carrying amount of goodwill | The changes in the carrying amount of goodwill were as follows:
| Balance at January 1, 2021 | Goodwill Acquired During the Year | Measurement Period Adjustments | Balance at March 31, 2021
| (In thousands)
Natural gas distribution | $ | 345,736 |  | $ | — |  | $ | — |  | $ | 345,736 |
Construction materials and contracting | 226,003 |  | — |  | — |  | 226,003 |
Construction services | 143,224 |  | — |  | — |  | 143,224 |
Total | $ | 714,963 |  | $ | — |  | $ | — |  | $ | 714,963 |
| Balance at January 1, 2020 | Goodwill Acquired During the Year | Measurement Period Adjustments | Balance at March 31, 2020
| (In thousands)
Natural gas distribution | $ | 345,736 |  | $ | — |  | $ | — |  | $ | 345,736 |
Construction materials and contracting | 217,234 |  | 6,483 |  | — |  | 223,717 |
Construction services | 118,388 |  | 25,686 |  | — |  | 144,074 |
Total | $ | 681,358 |  | $ | 32,169 |  | $ | — |  | $ | 713,527 |
| Balance at January 1, 2020 | Goodwill Acquired During the Year | Measurement Period Adjustments | Balance at December 31, 2020
| (In thousands)
Natural gas distribution | $ | 345,736 |  | $ | — |  | $ | — |  | $ | 345,736 |
Construction materials and contracting | 217,234 |  | 8,778 |  | (9) |  | 226,003 |
Construction services | 118,388 |  | 24,436 |  | 400 |  | 143,224 |
Total | $ | 681,358 |  | $ | 33,214 |  | $ | 391 |  | $ | 714,963 |
Other amortizable intangible assets | Other amortizable intangible assets were as follows:
| March 31, 2021 | March 31, 2020 | December 31, 2020
| (In thousands)
Customer relationships | $ | 28,836 |  | $ | 30,087 |  | $ | 28,836 |
Less accumulated amortization | 7,792 |  | 4,138 |  | 6,887 |
| 21,044 |  | 25,949 |  | 21,949 |
Noncompete agreements | 3,941 |  | 4,229 |  | 3,941 |
Less accumulated amortization | 2,441 |  | 1,928 |  | 2,309 |
| 1,500 |  | 2,301 |  | 1,632 |
Other | 11,957 |  | 13,060 |  | 12,927 |
Less accumulated amortization | 10,540 |  | 7,060 |  | 11,012 |
| 1,417 |  | 6,000 |  | 1,915 |
Total | $ | 23,961 |  | $ | 34,250 |  | $ | 25,496 |
Estimated amortization expense | Estimated amortization expense for identifiable intangible assets as of March 31, 2021, was:
| Remainder of 2021 | 2022 | 2023 | 2024 | 2025 | Thereafter
| (In thousands)
Amortization expense | $ | 3,377 |  | $ | 4,394 |  | $ | 4,121 |  | $ | 3,799 |  | $ | 1,862 |  | $ | 6,408 |

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