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Goodwill and other intangible assets | 6 Months Ended
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Jun. 30, 2021
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, 2021 | Goodwill Acquired During the Year | Measurement Period Adjustments | Balance at June 30, 2021
| (In thousands)
Natural gas distribution | $ | 345,736 |  | $ | — |  | $ | — |  | $ | 345,736 |
Construction materials and contracting | 226,003 |  | 2,900 |  | — |  | 228,903 |
Construction services | 143,224 |  | — |  | — |  | 143,224 |
Total | $ | 714,963 |  | $ | 2,900 |  | $ | — |  | $ | 717,863 |
| 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, 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 |
Other amortizable intangible assets were as follows:
| June 30, 2021 | June 30, 2020 | December 31, 2020
| (In thousands)
Customer relationships | $ | 29,423 |  | $ | 30,087 |  | $ | 28,836 |
Less accumulated amortization | 8,765 |  | 5,239 |  | 6,887 |
| 20,658 |  | 24,848 |  | 21,949 |
Noncompete agreements | 3,991 |  | 4,229 |  | 3,941 |
Less accumulated amortization | 2,576 |  | 2,084 |  | 2,309 |
| 1,415 |  | 2,145 |  | 1,632 |
Other | 11,957 |  | 13,060 |  | 12,927 |
Less accumulated amortization | 10,629 |  | 8,538 |  | 11,012 |
| 1,328 |  | 4,522 |  | 1,915 |
Total | $ | 23,401 |  | $ | 31,515 |  | $ | 25,496 |
The previous tables include goodwill and intangible assets associated with the business combinations completed during 2021 and 2020. For more information related to these business combinations, see Note 10. Amortization expense for amortizable intangible assets for the three and six months ended June 30, 2021, was $1.2 million and $2.7 million, respectively. Amortization expense for amortizable intangible assets for the three and six months ended June 30, 2020, was $2.7 million and $4.7 million, respectively. Estimated amortization expense for identifiable intangible assets as of June 30, 2021, was:
| Remainder of 2021 | 2022 | 2023 | 2024 | 2025 | Thereafter
| (In thousands)
Amortization expense | $ | 2,381 |  | $ | 4,678 |  | $ | 4,329 |  | $ | 3,957 |  | $ | 2,060 |  | $ | 5,996 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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