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Goodwill and other intangible assets (Tables) | 6 Months Ended
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Jun. 30, 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 June 30, 2021
| (In thousands)
Natural gas distribution | $ | 345,736 |  | $ | — |  | $ | — |  | $ | 345,736 |
Construction materials and contracting | 226,003 |  | 2,900 |  | — |  | 228,903 |
Construction services | 143,224 |  | — |  | — |  | 143,224 |
Total | $ | 714,963 |  | $ | 2,900 |  | $ | — |  | $ | 717,863 |
| Balance at January 1, 2020 | Goodwill Acquired During the Year | Measurement Period Adjustments | Balance at June 30, 2020
| (In thousands)
Natural gas distribution | $ | 345,736 |  | $ | — |  | $ | — |  | $ | 345,736 |
Construction materials and contracting | 217,234 |  | 6,483 |  | — |  | 223,717 |
Construction services | 118,388 |  | 24,436 |  | (3,613) |  | 139,211 |
Total | $ | 681,358 |  | $ | 30,919 |  | $ | (3,613) |  | $ | 708,664 |
| 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:
| June 30, 2021 | June 30, 2020 | December 31, 2020
| (In thousands)
Customer relationships | $ | 29,423 |  | $ | 30,087 |  | $ | 28,836 |
Less accumulated amortization | 8,765 |  | 5,239 |  | 6,887 |
| 20,658 |  | 24,848 |  | 21,949 |
Noncompete agreements | 3,991 |  | 4,229 |  | 3,941 |
Less accumulated amortization | 2,576 |  | 2,084 |  | 2,309 |
| 1,415 |  | 2,145 |  | 1,632 |
Other | 11,957 |  | 13,060 |  | 12,927 |
Less accumulated amortization | 10,629 |  | 8,538 |  | 11,012 |
| 1,328 |  | 4,522 |  | 1,915 |
Total | $ | 23,401 |  | $ | 31,515 |  | $ | 25,496 |
Estimated amortization expense | Estimated amortization expense for identifiable intangible assets as of June 30, 2021, was:
| Remainder of 2021 | 2022 | 2023 | 2024 | 2025 | Thereafter
| (In thousands)
Amortization expense | $ | 2,381 |  | $ | 4,678 |  | $ | 4,329 |  | $ | 3,957 |  | $ | 2,060 |  | $ | 5,996 |

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