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Goodwill and other intangible assets (Tables) | 9 Months Ended
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Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in the carrying amount of goodwill | The changes in the carrying amount of goodwill were as follows:
Nine Months Ended September 30, 2015 | Balance as of January 1, 2015 |  | * | Goodwill Acquired During the Year |  | Balance as of September 30, 2015 |  | *
| (In thousands)
Natural gas distribution | $ | 345,736 |  |  | $ | — |  | $ | 345,736 |  |
Pipeline and energy services | 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 energy services segment, which occurred in prior periods.
Nine Months Ended September 30, 2014 | Balance as of January 1, 2014 |  | * | Goodwill Acquired During the Year |  | Balance as of September 30, 2014 |  | *
| (In thousands)
Natural gas distribution | $ | 345,736 |  |  | $ | — |  | $ | 345,736 |  |
Pipeline and energy services | 9,737 |  |  | — |  | 9,737 |  |
Construction materials and contracting | 176,290 |  |  | — |  | 176,290 |  |
Construction services | 104,276 |  |  | — |  | 104,276 |  |
Total | $ | 636,039 |  |  | $ | — |  | $ | 636,039 |  |
* Balance is presented net of accumulated impairment of $12.3 million at the pipeline and energy services segment, which occurred in prior periods.
Year Ended December 31, 2014 | Balance as of January 1, 2014 |  | * | Goodwill Acquired During the Year/Other |  | Balance as of December 31, 2014 |  | *
| (In thousands)
Natural gas distribution | $ | 345,736 |  |  | $ | — |  | $ | 345,736 |  |
Pipeline and energy services | 9,737 |  |  | — |  | 9,737 |  |
Construction materials and contracting | 176,290 |  |  | — |  | 176,290 |  |
Construction services | 104,276 |  |  | (835 | ) | 103,441 |  |
Total | $ | 636,039 |  |  | $ | (835 | ) | $ | 635,204 |  |
* Balance is presented net of accumulated impairment of $12.3 million at the pipeline and energy services segment, which occurred in prior periods.
Other amortizable intangible assets | Other amortizable intangible assets were as follows:
| September 30, 2015 |  | September 30, 2014 |  | December 31, 2014 |
| (In thousands)
Customer relationships | $ | 20,975 |  | $ | 21,310 |  | $ | 21,310 |
Accumulated amortization | (16,455 | ) | (15,116 | ) | (15,556 | )
| 4,520 |  | 6,194 |  | 5,754 |
Noncompete agreements | 4,409 |  | 5,080 |  | 5,080 |
Accumulated amortization | (3,632 | ) | (4,021 | ) | (4,098 | )
| 777 |  | 1,059 |  | 982 |
Other | 8,300 |  | 10,921 |  | 10,921 |
Accumulated amortization | (5,689 | ) | (7,578 | ) | (7,817 | )
| 2,611 |  | 3,343 |  | 3,104 |
Total | $ | 7,908 |  | $ | 10,596 |  | $ | 9,840 |

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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=26713463&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=26713463&loc=d3e16265-109275 + Details
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