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Goodwill and other intangible assets (Tables) | 3 Months Ended
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Mar. 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 March 31, 2022
| (In thousands)
Natural gas distribution | $ | 345,736 |  | $ | — |  | $ | — |  | $ | 345,736 |
Construction materials and contracting | 276,426 |  | — |  | (2,124) |  | 274,302 |
Construction services | 143,224 |  | — |  | — |  | 143,224 |
Total | $ | 765,386 |  | $ | — |  | $ | (2,124) |  | $ | 763,262 |
| 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, 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 were as follows:
| March 31, 2022 | March 31, 2021 | December 31, 2021
| (In thousands)
Customer relationships | $ | 28,990 |  | $ | 28,836 |  | $ | 29,740 |
Less accumulated amortization | 10,846 |  | 7,792 |  | 10,650 |
| 18,144 |  | 21,044 |  | 19,090 |
Noncompete agreements | 4,591 |  | 3,941 |  | 4,591 |
Less accumulated amortization | 3,016 |  | 2,441 |  | 2,856 |
| 1,575 |  | 1,500 |  | 1,735 |
Other | 6,969 |  | 11,957 |  | 12,601 |
Less accumulated amortization | 5,299 |  | 10,540 |  | 10,848 |
| 1,670 |  | 1,417 |  | 1,753 |
Total | $ | 21,389 |  | $ | 23,961 |  | $ | 22,578 |
Estimated amortization expense | Estimated amortization expense for identifiable intangible assets as of March 31, 2022, was:
| Remainder of 2022 | 2023 | 2024 | 2025 | 2026 | Thereafter
| (In thousands)
Amortization expense | $ | 3,630 |  | $ | 4,470 |  | $ | 4,200 |  | $ | 2,206 |  | $ | 1,716 |  | $ | 5,167 |

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