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Goodwill and other intangible assets (Tables) | 12 Months Ended
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Dec. 31, 2022
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, 2022 | Goodwill Acquired During the Year | Measurement Period Adjustments | Balance at December 31, 2022
| (In thousands)
Natural gas distribution | $ | 345,736 |  | $ | — |  | $ | — |  | $ | 345,736 |
Construction materials and contracting | 276,426 |  | 238 |  | (2,124) |  | 274,540 |
Construction services | 143,224 |  | — |  | — |  | 143,224 |
Total | $ | 765,386 |  | $ | 238 |  | $ | (2,124) |  | $ | 763,500 |
| 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 |
Other amortizable intangible assets | Other amortizable intangible assets at December 31 were as follows:
| 2022 | 2021
| (In thousands)
Customer relationships | $ | 28,990 |  | $ | 29,740 |
Less accumulated amortization | 13,724 |  | 10,650 |
| 15,266 |  | 19,090 |
Noncompete agreements | 4,591 |  | 4,591 |
Less accumulated amortization | 3,529 |  | 2,856 |
| 1,062 |  | 1,735 |
Other | 5,280 |  | 12,601 |
Less accumulated amortization | 4,076 |  | 10,848 |
| 1,204 |  | 1,753 |
Total | $ | 17,532 |  | $ | 22,578 |
Estimated amortization expense | The amounts of estimated amortization expense for identifiable intangible assets as of December 31, 2022, were:
| 2023 | 2024 | 2025 | 2026 | 2027 | Thereafter
| (In thousands)
Amortization expense | $ | 4,591 |  | $ | 4,249 |  | $ | 2,200 |  | $ | 1,782 |  | $ | 1,759 |  | $ | 2,951 |

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