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Goodwill and other intangible assets | 6 Months Ended
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Jun. 30, 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 were as follows:
Six Months Ended June 30, 2019 | Balance at January 1, 2019 |  | Goodwill Acquired During the Year |  | Balance at June 30, 2019 |
| (In thousands)
Natural gas distribution | $ | 345,736 |  | $ | — |  | $ | 345,736 |
Construction materials and contracting | 209,421 |  | 14,473 |  | 223,894 |
Construction services | 109,765 |  | — |  | 109,765 |
Total | $ | 664,922 |  | $ | 14,473 |  | $ | 679,395 |
Six Months Ended June 30, 2018 | Balance at January 1, 2018 |  | Goodwill Acquired During the Year |  | Balance at June 30, 2018 |
| (In thousands)
Natural gas distribution | $ | 345,736 |  | $ | — |  | $ | 345,736 |
Construction materials and contracting | 176,290 |  | 10,583 |  | 186,873 |
Construction services | 109,765 |  | — |  | 109,765 |
Total | $ | 631,791 |  | $ | 10,583 |  | $ | 642,374 |
Year Ended December 31, 2018 | Balance at January 1, 2018 |  | Goodwill Acquired During the Year |  | 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 one and four business combinations, respectively, and the results of the acquired businesses have been included in the Company's construction materials and contracting segment. These business combinations increased the construction materials and contracting segment's goodwill balance at June 30, 2019 and 2018, and December 31, 2018, as noted in the previous tables. As a result of the business combinations, other intangible assets increased $1.6 million at June 30, 2019, compared to December 31, 2018. For more information related to business combinations, see Note 9. Other amortizable intangible assets were as follows:
| June 30, 2019 |  | June 30, 2018 |  | December 31, 2018 |
| (In thousands)
Customer relationships | $ | 14,601 |  | $ | 15,587 |  | $ | 22,720 |
Less accumulated amortization | 5,629 |  | 13,191 |  | 13,535 |
| 8,972 |  | 2,396 |  | 9,185 |
Noncompete agreements | 3,179 |  | 2,546 |  | 2,605 |
Less accumulated amortization | 1,798 |  | 1,877 |  | 1,956 |
| 1,381 |  | 669 |  | 649 |
Other | 6,578 |  | 6,458 |  | 6,458 |
Less accumulated amortization | 5,608 |  | 5,333 |  | 5,477 |
| 970 |  | 1,125 |  | 981 |
Total | $ | 11,323 |  | $ | 4,190 |  | $ | 10,815 |
Amortization expense for amortizable intangible assets for the three and six months ended June 30, 2019, was $500,000 and $1.1 million, respectively. Amortization expense for amortizable intangible assets for the three and six months ended June 30, 2018, was $300,000 and $700,000, respectively. Estimated amortization expense for identifiable intangible assets as of June 30, 2019, was:
| Remainder of 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 |  | Thereafter |
| (In thousands)
Amortization expense | $ | 938 |  | $ | 1,644 |  | $ | 1,254 |  | $ | 1,231 |  | $ | 1,249 |  | $ | 5,007 |

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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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