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Goodwill and other intangible assets (Tables) | 12 Months Ended
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Dec. 31, 2020
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, 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 |
| Balance at January 1, 2019 | Goodwill Acquired During the Year | Measurement Period Adjustments |  |  | Balance at December 31, 2019
| (In thousands)
Natural gas distribution | $ | 345,736 |  | $ | — |  | $ | — |  |  |  | $ | 345,736 |
Construction materials and contracting | 209,421 |  | 14,482 |  | (6,669) |  |  |  | 217,234 |
Construction services | 109,765 |  | 8,623 |  | — |  |  |  | 118,388 |
Total | $ | 664,922 |  | $ | 23,105 |  | $ | (6,669) |  |  |  | $ | 681,358 |
Other amortizable intangible assets | Other amortizable intangible assets at December 31 were as follows:
| 2020 | 2019
| (In thousands)
Customer relationships | $ | 28,836 |  | $ | 17,958 |
Less accumulated amortization | 6,887 |  | 6,268 |
| 21,949 |  | 11,690 |
Noncompete agreements | 3,941 |  | 3,439 |
Less accumulated amortization | 2,309 |  | 1,957 |
| 1,632 |  | 1,482 |
Other | 12,927 |  | 8,094 |
Less accumulated amortization | 11,012 |  | 6,020 |
| 1,915 |  | 2,074 |
Total | $ | 25,496 |  | $ | 15,246 |
Estimated amortization expense | The amounts of estimated amortization expense for identifiable intangible assets as of December 31, 2020, were:
| 2021 | 2022 | 2023 | 2024 | 2025 | Thereafter
| (In thousands)
Amortization expense | $ | 4,911 |  | $ | 4,394 |  | $ | 4,121 |  | $ | 3,799 |  | $ | 1,862 |  | $ | 6,409 |

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