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Goodwill and other intangible assets (Tables) | 12 Months Ended
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Dec. 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 December 31, 2021
| (In thousands)
Natural gas distribution | $ | 345,736 |  | $ | — |  | $ | — |  | $ | 345,736 |
Construction materials and contracting | 226,003 |  | 50,640 |  | (217) |  | 276,426 |
Construction services | 143,224 |  | — |  | — |  | 143,224 |
Total | $ | 714,963 |  | $ | 50,640 |  | $ | (217) |  | $ | 765,386 |
| 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 at December 31 were as follows:
| 2021 | 2020
| (In thousands)
Customer relationships | $ | 29,740 |  | $ | 28,836 |
Less accumulated amortization | 10,650 |  | 6,887 |
| 19,090 |  | 21,949 |
Noncompete agreements | 4,591 |  | 3,941 |
Less accumulated amortization | 2,856 |  | 2,309 |
| 1,735 |  | 1,632 |
Other | 12,601 |  | 12,927 |
Less accumulated amortization | 10,848 |  | 11,012 |
| 1,753 |  | 1,915 |
Total | $ | 22,578 |  | $ | 25,496 |
Estimated amortization expense | The amounts of estimated amortization expense for identifiable intangible assets as of December 31, 2021, were:
| 2022 | 2023 | 2024 | 2025 | 2026 | Thereafter
| (In thousands)
Amortization expense | $ | 4,928 |  | $ | 4,578 |  | $ | 4,308 |  | $ | 2,314 |  | $ | 1,693 |  | $ | 4,757 |

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