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Goodwill and other intangible assets | 12 Months Ended
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Dec. 31, 2020
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, 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 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 |
The previous tables include goodwill and intangible assets associated with the business combinations completed during 2020 and 2019. For more information related to these business combinations, see Note 4. Amortization expense for amortizable intangible assets for the years ended December 31, 2020, 2019 and 2018, was $9.0 million, $2.4 million and $1.2 million, respectively. 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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- 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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