XML 29 R13.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Goodwill and other intangible assets | 12 Months Ended
--- | ---
Dec. 31, 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 for the year ended December 31, 2018, were as follows:
| 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 |
The changes in the carrying amount of goodwill for the year ended December 31, 2017, were as follows:
| 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 |
During 2018, the Company completed four acquisitions and the results of the acquired businesses have been included in the Company's construction materials and contracting segment. At December 31, 2018, the construction materials and contracting segment's goodwill increased by $33.1 million and other intangible assets increased by $8.2 million for these acquisitions. For more information about these acquisitions, see Note 3. Other amortizable intangible assets at December 31 were as follows:
| 2018 |  | 2017 |
| (In thousands)
Customer relationships | $ | 22,720 |  | $ | 15,248 |
Less accumulated amortization | 13,535 |  | 13,382 |
| 9,185 |  | 1,866 |
Noncompete agreements | 2,605 |  | 2,430 |
Less accumulated amortization | 1,956 |  | 1,805 |
| 649 |  | 625 |
Other | 6,458 |  | 6,990 |
Less accumulated amortization | 5,477 |  | 5,644 |
| 981 |  | 1,346 |
Total | $ | 10,815 |  | $ | 3,837 |
Amortization expense for amortizable intangible assets for the years ended December 31, 2018, 2017 and 2016, was $1.2 million, $2.0 million and $2.5 million, respectively. The amounts of estimated amortization expense for identifiable intangible assets as of December 31, 2018, were:
| 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 |  | Thereafter |
| (In thousands)
Amortization expense | $ | 1,856 |  | $ | 1,486 |  | $ | 1,096 |  | $ | 1,072 |  | $ | 1,006 |  | $ | 4,299 |

X
- References No definition available. + Details
Name: | us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration