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Goodwill and other intangible assets | 12 Months Ended
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Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and other intangible assets | Goodwill and Other Intangible Assets The changes in the carrying amount of goodwill for the year ended December 31, 2019, were as follows:
| 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 |
The changes in the carrying amount of goodwill for the year ended December 31, 2018, were as follows:
| Balance at January 1, 2018 |  | Goodwill Acquired During the Year |  | Measurement Period Adjustments |  | Balance at December 31, 2018 |
| (In thousands)
Natural gas distribution | $ | 345,736 |  | $ | — |  | $ | — |  | $ | 345,736 |
Construction materials and contracting | 176,290 |  | 33,131 |  | — |  | 209,421 |
Construction services | 109,765 |  | — |  | — |  | 109,765 |
Total | $ | 631,791 |  | $ | 33,131 |  | $ | — |  | $ | 664,922 |
During 2019 and 2018, the Company completed three and four business combinations, respectively, and the results of these acquisitions have been included in the Company's construction materials and contracting and construction services segments. These business combinations increased the construction materials and contracting segment's goodwill balance at December 31, 2019 and 2018, respectively, and increased the construction services segment's goodwill balance at December 31, 2019, as noted in the previous tables. At December 31, 2019 and 2018, the impacts of these business combinations on other intangible assets resulted in an increase of $6.8 million and $8.2 million, respectively. For more information related to these business combinations, see Note 3. Other amortizable intangible assets at December 31 were as follows:
| 2019 |  | 2018 |
| (In thousands)
Customer relationships | $ | 17,958 |  | $ | 22,720 |
Less accumulated amortization | 6,268 |  | 13,535 |
| 11,690 |  | 9,185 |
Noncompete agreements | 3,439 |  | 2,605 |
Less accumulated amortization | 1,957 |  | 1,956 |
| 1,482 |  | 649 |
Other | 8,094 |  | 6,458 |
Less accumulated amortization | 6,020 |  | 5,477 |
| 2,074 |  | 981 |
Total | $ | 15,246 |  | $ | 10,815 |
Amortization expense for amortizable intangible assets for the years ended December 31, 2019, 2018 and 2017, was $2.4 million, $1.2 million and $2.0 million, respectively. The amounts of estimated amortization expense for identifiable intangible assets as of December 31, 2019, were:
| 2020 |  | 2021 |  | 2022 |  | 2023 |  | 2024 |  | Thereafter |
| (In thousands)
Amortization expense | $ | 3,365 |  | $ | 2,016 |  | $ | 1,968 |  | $ | 1,924 |  | $ | 1,610 |  | $ | 4,363 |

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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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