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Goodwill and other intangible assets (Tables) | 3 Months Ended
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Mar. 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 March 31, 2020 |
| (In thousands)
Natural gas distribution | $ | 345,736 |  | $ | — |  | $ | — |  | $ | 345,736 |
Construction materials and contracting | 217,234 |  | 6,483 |  | — |  | 223,717 |
Construction services | 118,388 |  | 25,686 |  | — |  | 144,074 |
Total | $ | 681,358 |  | $ | 32,169 |  | $ | — |  | $ | 713,527 |
| Balance at January 1, 2019 |  | Goodwill Acquired During the Year |  | Measurement Period Adjustments |  | Balance at March 31, 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:
| March 31, 2020 |  | March 31, 2019 |  | December 31, 2019 |
| (In thousands)
Customer relationships | $ | 30,087 |  | $ | 14,471 |  | $ | 17,958 |
Less accumulated amortization | 4,138 |  | 5,156 |  | 6,268 |
| 25,949 |  | 9,315 |  | 11,690 |
Noncompete agreements | 4,229 |  | 3,179 |  | 3,439 |
Less accumulated amortization | 1,928 |  | 1,730 |  | 1,957 |
| 2,301 |  | 1,449 |  | 1,482 |
Other | 13,060 |  | 6,458 |  | 8,094 |
Less accumulated amortization | 7,060 |  | 5,542 |  | 6,020 |
| 6,000 |  | 916 |  | 2,074 |
Total | $ | 34,250 |  | $ | 11,680 |  | $ | 15,246 |
Estimated amortization expense | Estimated amortization expense for identifiable intangible assets as of March 31, 2020, was:
| Remainder of 2020 |  | 2021 |  | 2022 |  | 2023 |  | 2024 |  | Thereafter |
| (In thousands)
Amortization expense | $ | 8,048 |  | $ | 5,199 |  | $ | 4,711 |  | $ | 4,490 |  | $ | 4,160 |  | $ | 7,642 |

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