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Goodwill and other intangible assets (Tables) | 9 Months Ended
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Sep. 30, 2014
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, 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.
Nine Months Ended September 30, 2013 | Balance as of January 1, 2013* | Goodwill Acquired During the Year | Balance as of September 30, 2013*
| (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, 2013 | Balance as of January 1, 2013* | Goodwill Acquired During the Year | Balance as of December 31, 2013*
| (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.
Other amortizable intangible assets | Other amortizable intangible assets were as follows:
| September 30, 2014 | September 30, 2013 | December 31, 2013
| (In thousands)
Customer relationships | $ | 21,310 |  | $ | 21,310 |  | $ | 21,310 |
Accumulated amortization | (15,116 | ) | (13,221 | ) | (13,726 | )
| 6,194 |  | 8,089 |  | 7,584 |
Noncompete agreements | 5,080 |  | 6,186 |  | 6,186 |
Accumulated amortization | (4,021 | ) | (4,706 | ) | (4,840 | )
| 1,059 |  | 1,480 |  | 1,346 |
Other | 10,921 |  | 10,995 |  | 10,995 |
Accumulated amortization | (7,578 | ) | (6,472 | ) | (6,826 | )
| 3,343 |  | 4,523 |  | 4,169 |
Total | $ | 10,596 |  | $ | 14,092 |  | $ | 13,099 |

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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 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 Reference 2: 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 + 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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