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Goodwill and other intangible assets (Tables) | 6 Months Ended
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Jun. 30, 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 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, 2019 | Goodwill Acquired During the Year | Measurement Period Adjustments | Balance at June 30, 2019
| (In thousands) |  |  |
Natural gas distribution | $ | 345,736 |  | $ | — |  | $ | — |  | $ | 345,736 |
Construction materials and contracting | 209,421 |  | 14,473 |  | — |  | 223,894 |
Construction services | 109,765 |  | — |  | — |  | 109,765 |
Total | $ | 664,922 |  | $ | 14,473 |  | $ | — |  | $ | 679,395 |
| 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 were as follows:
| June 30, 2020 | June 30, 2019 | December 31, 2019
| (In thousands) |  |
Customer relationships | $ | 30,087 |  | $ | 14,601 |  | $ | 17,958 |
Less accumulated amortization | 5,239 |  | 5,629 |  | 6,268 |
| 24,848 |  | 8,972 |  | 11,690 |
Noncompete agreements | 4,229 |  | 3,179 |  | 3,439 |
Less accumulated amortization | 2,084 |  | 1,798 |  | 1,957 |
| 2,145 |  | 1,381 |  | 1,482 |
Other | 13,060 |  | 6,578 |  | 8,094 |
Less accumulated amortization | 8,538 |  | 5,608 |  | 6,020 |
| 4,522 |  | 970 |  | 2,074 |
Total | $ | 31,515 |  | $ | 11,323 |  | $ | 15,246 |
Estimated amortization expense | Estimated amortization expense for identifiable intangible assets as of June 30, 2020, was:
| Remainder of 2020 | 2021 | 2022 | 2023 | 2024 | Thereafter
| (In thousands) |  |  |  |  |
Amortization expense | $ | 5,313 |  | $ | 5,199 |  | $ | 4,711 |  | $ | 4,490 |  | $ | 4,160 |  | $ | 7,642 |

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