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Goodwill and other intangible assets (Tables) | 6 Months Ended
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Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in the carrying amount of goodwill | 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 |
Other amortizable intangible assets | 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 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] | 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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