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Goodwill and other intangible assets (Tables) | 3 Months Ended
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Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in the carrying amount of goodwill | The changes in the carrying amount of goodwill were as follows:
Three Months Ended March 31, 2016 | Balance as of January 1, 2016 |  | * | Goodwill Acquired During the Year |  | Balance as of March 31, 2016 |  | *
| (In thousands)
Natural gas distribution | $ | 345,736 |  |  | $ | — |  | $ | 345,736 |  |
Pipeline and midstream | 9,737 |  |  | — |  | 9,737 |  |
Construction materials and contracting | 176,290 |  |  | — |  | 176,290 |  |
Construction services | 103,441 |  |  | 6,323 |  | 109,764 |  |
Total | $ | 635,204 |  |  | $ | 6,323 |  | $ | 641,527 |  |
* Balance is presented net of accumulated impairment of $12.3 million at the pipeline and midstream segment, which occurred in prior periods.
Three Months Ended March 31, 2015 | Balance as of January 1, 2015 |  | * | Goodwill Acquired During the Year |  | Balance as of March 31, 2015 |  | *
| (In thousands)
Natural gas distribution | $ | 345,736 |  |  | $ | — |  | $ | 345,736 |  |
Pipeline and midstream | 9,737 |  |  | — |  | 9,737 |  |
Construction materials and contracting | 176,290 |  |  | — |  | 176,290 |  |
Construction services | 103,441 |  |  | — |  | 103,441 |  |
Total | $ | 635,204 |  |  | $ | — |  | $ | 635,204 |  |
* Balance is presented net of accumulated impairment of $12.3 million at the pipeline and midstream segment, which occurred in prior periods.
Year Ended December 31, 2015 | Balance as of January 1, 2015 |  | * | Goodwill Acquired During the Year |  | Balance as of December 31, 2015 |  | *
| (In thousands)
Natural gas distribution | $ | 345,736 |  |  | $ | — |  | $ | 345,736 |  |
Pipeline and midstream | 9,737 |  |  | — |  | 9,737 |  |
Construction materials and contracting | 176,290 |  |  | — |  | 176,290 |  |
Construction services | 103,441 |  |  | — |  | 103,441 |  |
Total | $ | 635,204 |  |  | $ | — |  | $ | 635,204 |  |
* Balance is presented net of accumulated impairment of $12.3 million at the pipeline and midstream segment, which occurred in prior periods.
Other amortizable intangible assets | Other amortizable intangible assets were as follows:
| March 31, 2016 |  | March 31, 2015 |  | December 31, 2015 |
| (In thousands)
Customer relationships | $ | 17,145 |  | $ | 20,975 |  | $ | 20,975 |
Accumulated amortization | (12,680 | ) | (15,649 | ) | (16,845 | )
| 4,465 |  | 5,326 |  | 4,130 |
Noncompete agreements | 2,430 |  | 4,409 |  | 4,409 |
Accumulated amortization | (1,548 | ) | (3,504 | ) | (3,655 | )
| 882 |  | 905 |  | 754 |
Other | 7,764 |  | 8,300 |  | 8,304 |
Accumulated amortization | (5,308 | ) | (5,365 | ) | (5,846 | )
| 2,456 |  | 2,935 |  | 2,458 |
Total | $ | 7,803 |  | $ | 9,166 |  | $ | 7,342 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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