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Goodwill and other intangible assets | 6 Months Ended
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Jun. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and other intangible assets | Goodwill and other intangible assets The carrying amount of goodwill, which is related to the natural gas distribution and construction services segments, remained unchanged at $489.0 million at June 30, 2023 and 2022, and December 31, 2022. No impairments of goodwill have been recorded in these periods. Other amortizable intangible assets were as follows:
| June 30, 2023 | June 30, 2022 | December 31, 2022
| (In thousands)
Customer relationships | $ | 10,450 |  | $ | 10,450 |  | $ | 10,450 |
Less accumulated amortization | 7,401 |  | 5,312 |  | 6,356 |
| 3,049 |  | 5,138 |  | 4,094 |
Noncompete agreements | 292 |  | 552 |  | 552 |
Less accumulated amortization | 292 |  | 477 |  | 544 |
| — |  | 75 |  | 8 |
Total | $ | 3,049 |  | $ | 5,213 |  | $ | 4,102 |
Amortization expense for amortizable intangible assets for the three and six months ended June 30, 2023, was $522,000 and $1.1 million, respectively. Amortization expense for amortizable intangible assets for the three and six months ended June 30, 2022, was $568,000 and $1.1 million, respectively. Amortization expense for identifiable intangible assets as of June 30, 2023 is estimated to be as follows:
| Remainder of 2023 | 2024 | 2025 | 2026 | 2027 | Thereafter
| (In thousands)
Amortization expense | $ | 1,045 |  | $ | 1,888 |  | $ | 116 |  | $ | — |  | $ | — |  | $ | — |

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