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Goodwill and other intangible assets | 12 Months Ended
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Dec. 31, 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 December 31, 2022
| (In thousands)
Natural gas distribution | $ | 345,736 |  | $ | — |  | $ | — |  | $ | 345,736 |
Construction materials and contracting | 276,426 |  | 238 |  | (2,124) |  | 274,540 |
Construction services | 143,224 |  | — |  | — |  | 143,224 |
Total | $ | 765,386 |  | $ | 238 |  | $ | (2,124) |  | $ | 763,500 |
| 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 at December 31 were as follows:
| 2022 | 2021
| (In thousands)
Customer relationships | $ | 28,990 |  | $ | 29,740 |
Less accumulated amortization | 13,724 |  | 10,650 |
| 15,266 |  | 19,090 |
Noncompete agreements | 4,591 |  | 4,591 |
Less accumulated amortization | 3,529 |  | 2,856 |
| 1,062 |  | 1,735 |
Other | 5,280 |  | 12,601 |
Less accumulated amortization | 4,076 |  | 10,848 |
| 1,204 |  | 1,753 |
Total | $ | 17,532 |  | $ | 22,578 |
The previous tables include goodwill and intangible assets associated with the business combinations completed during 2022 and 2021. For more information related to these business combinations, see Note 4. Amortization expense for amortizable intangible assets for the years ended December 31, 2022, 2021 and 2020, was $5.0 million, $5.1 million and $9.0 million, respectively. The amounts of estimated amortization expense for identifiable intangible assets as of December 31, 2022, were:
| 2023 | 2024 | 2025 | 2026 | 2027 | Thereafter
| (In thousands)
Amortization expense | $ | 4,591 |  | $ | 4,249 |  | $ | 2,200 |  | $ | 1,782 |  | $ | 1,759 |  | $ | 2,951 |
At October 31, 2022, the fair value substantially exceeded the carrying value at the Company's reporting units with goodwill, with the exception of the natural gas distribution reporting unit. The Company's annual impairment testing indicated the natural gas distribution reporting units fair value is not substantially in excess of its carrying value ("cushion"). Based on the Company's assessment, the estimated fair value of the natural gas distribution reporting unit exceeded its carrying value, which includes $345.7 million of goodwill, by approximately 8 percent as of October 31, 2022. The decrease in the natural gas distribution reporting unit's cushion from the prior year was primarily attributable to the risk adjusted cost of capital increasing from 5.0 percent in 2021 to 6.4 percent 2022, which directly correlates with the treasury rates at the date of the test. The natural gas distribution reporting unit is at risk of future impairment if projected operating results are not met or other inputs into the fair value measurement model change.

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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 https://asc.fasb.org/topic&trid=2144416 + Details
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