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Goodwill and other intangible assets | 9 Months Ended
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Sep. 30, 2018
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:
Nine Months Ended September 30, 2018 | Balance at January 1, 2018 |  | Goodwill Acquired During the Year* |  | Balance at September 30, 2018 |
| (In thousands)
Natural gas distribution | $ | 345,736 |  | $ | — |  | $ | 345,736 |
Construction materials and contracting | 176,290 |  | 8,412 |  | 184,702 |
Construction services | 109,765 |  | — |  | 109,765 |
Total | $ | 631,791 |  | $ | 8,412 |  | $ | 640,203 |
* | Relates to business acquisitions that occurred during the period, as discussed in Note 9.
Nine Months Ended September 30, 2017 | Balance at January 1, 2017 |  | Goodwill Acquired During the Year |  | Balance at September 30, 2017 |
| (In thousands)
Natural gas distribution | $ | 345,736 |  | $ | — |  | $ | 345,736 |
Construction materials and contracting | 176,290 |  | — |  | 176,290 |
Construction services | 109,765 |  | — |  | 109,765 |
Total | $ | 631,791 |  | $ | — |  | $ | 631,791 |
Year Ended December 31, 2017 | Balance at January 1, 2017 |  | Goodwill Acquired During the Year |  | Balance at December 31, 2017 |
| (In thousands)
Natural gas distribution | $ | 345,736 |  | $ | — |  | $ | 345,736 |
Construction materials and contracting | 176,290 |  | — |  | 176,290 |
Construction services | 109,765 |  | — |  | 109,765 |
Total | $ | 631,791 |  | $ | — |  | $ | 631,791 |
Other amortizable intangible assets were as follows:
| September 30, 2018 |  | September 30, 2017 |  | December 31, 2017 |
| (In thousands)
Customer relationships | $ | 15,920 |  | $ | 15,248 |  | $ | 15,248 |
Less accumulated amortization | 13,342 |  | 13,176 |  | 13,382 |
| 2,578 |  | 2,072 |  | 1,866 |
Noncompete agreements | 2,606 |  | 2,430 |  | 2,430 |
Less accumulated amortization | 1,911 |  | 1,769 |  | 1,805 |
| 695 |  | 661 |  | 625 |
Other | 6,458 |  | 7,020 |  | 6,990 |
Less accumulated amortization | 5,413 |  | 5,544 |  | 5,644 |
| 1,045 |  | 1,476 |  | 1,346 |
Total | $ | 4,318 |  | $ | 4,209 |  | $ | 3,837 |
Amortization expense for amortizable intangible assets for the three and nine months ended September 30, 2018, was $300,000 and $900,000, respectively. Amortization expense for amortizable intangible assets for the three and nine months ended September 30, 2017, was $500,000 and $1.7 million, respectively. Estimated amortization expense for amortizable intangible assets is $1.4 million in 2018, $1.2 million in 2019, $600,000 in 2020, $400,000 in 2021, $400,000 in 2022 and $1.2 million thereafter.

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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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