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Goodwill and other intangible assets (Tables) | 6 Months Ended
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Jun. 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:
Six Months Ended June 30, 2015 | Balance as of January 1, 2015* | Goodwill Acquired During the Year | Balance as of June 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.
Six Months Ended June 30, 2014 | Balance as of January 1, 2014* | Goodwill Acquired During the Year | Balance as of June 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:
| June 30, 2015 | June 30, 2014 | December 31, 2014
| (In thousands)
Customer relationships | $ | 20,975 |  | $ | 21,310 |  | $ | 21,310 |
Accumulated amortization | (16,065 | ) | (14,734 | ) | (15,556 | )
| 4,910 |  | 6,576 |  | 5,754 |
Noncompete agreements | 4,409 |  | 5,080 |  | 5,080 |
Accumulated amortization | (3,581 | ) | (3,936 | ) | (4,098 | )
| 828 |  | 1,144 |  | 982 |
Other | 8,300 |  | 10,921 |  | 10,921 |
Accumulated amortization | (5,532 | ) | (7,375 | ) | (7,817 | )
| 2,768 |  | 3,546 |  | 3,104 |
Total | $ | 8,506 |  | $ | 11,266 |  | $ | 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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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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