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Goodwill and other intangible assets | 9 Months Ended
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Sep. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and other intangible assets | Goodwill and other intangible assets 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 September 30, 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 September 30, 2021
| (In thousands)
Natural gas distribution | $ | 345,736 |  | $ | — |  | $ | — |  | $ | 345,736 |
Construction materials and contracting | 226,003 |  | 2,900 |  | (217) |  | 228,686 |
Construction services | 143,224 |  | — |  | — |  | 143,224 |
Total | $ | 714,963 |  | $ | 2,900 |  | $ | (217) |  | $ | 717,646 |
| 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 were as follows:
| September 30, 2022 | September 30, 2021 | December 31, 2021
| (In thousands)
Customer relationships | $ | 28,990 |  | $ | 29,423 |  | $ | 29,740 |
Less accumulated amortization | 12,768 |  | 9,705 |  | 10,650 |
| 16,222 |  | 19,718 |  | 19,090 |
Noncompete agreements | 4,591 |  | 3,991 |  | 4,591 |
Less accumulated amortization | 3,377 |  | 2,710 |  | 2,856 |
| 1,214 |  | 1,281 |  | 1,735 |
Other | 5,279 |  | 11,957 |  | 12,601 |
Less accumulated amortization | 3,970 |  | 10,715 |  | 10,848 |
| 1,309 |  | 1,242 |  | 1,753 |
Total | $ | 18,745 |  | $ | 22,241 |  | $ | 22,578 |
The previous tables include goodwill and intangible assets associated with the business combinations completed during 2021. For more information related to these business combinations, see Note 10. Amortization expense for amortizable intangible assets for the three and nine months ended September 30, 2022, was $1.3 million and $3.8 million, respectively. Amortization expense for amortizable intangible assets for the three and nine months ended September 30, 2021, was $1.2 million and $3.9 million, respectively. Estimated amortization expense for identifiable intangible assets as of September 30, 2022, was:
| Remainder of 2022 | 2023 | 2024 | 2025 | 2026 | Thereafter
| (In thousands)
Amortization expense | $ | 1,159 |  | $ | 4,591 |  | $ | 4,249 |  | $ | 2,200 |  | $ | 1,781 |  | $ | 4,765 |

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