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Goodwill and other intangible assets (Tables) | 6 Months Ended
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Jun. 30, 2013
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, 2013 | Balance as of January 1, 2013* | Goodwill Acquired During the Year | Balance as of June 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.
Six Months Ended June 30, 2012 | Balance as of January 1, 2012* | Goodwill Acquired During the Year** | Balance as of June 30, 2012*
| (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 | 103,168 |  | 458 |  | 103,626 |
Total | $ | 634,931 |  | $ | 458 |  | $ | 635,389 |
* Balance is presented net of accumulated impairment of $12.3 million at the pipeline and energy services segment, which occurred in prior periods. ** Includes contingent consideration that was not material related to an acquisition in a prior period.
Year Ended December 31, 2012 | Balance as of January 1, 2012* | Goodwill Acquired During the Year** | Balance as of December 31, 2012*
| (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 | 103,168 |  | 1,108 |  | 104,276 |
Total | $ | 634,931 |  | $ | 1,108 |  | $ | 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. ** Includes contingent consideration that was not material related to an acquisition in a prior period.
Other amortizable intangible assets | Other amortizable intangible assets were as follows:
| June 30, 2013 | June 30, 2012 | December 31, 2012
| (In thousands)
Customer relationships | $ | 21,310 |  | $ | 21,010 |  | $ | 21,310 |
Accumulated amortization | (12,715 | ) | (10,690 | ) | (11,701 | )
| 8,595 |  | 10,320 |  | 9,609 |
Noncompete agreements | 6,186 |  | 7,086 |  | 7,236 |
Accumulated amortization | (4,557 | ) | (5,057 | ) | (5,326 | )
| 1,629 |  | 2,029 |  | 1,910 |
Other | 10,979 |  | 10,978 |  | 10,979 |
Accumulated amortization | (5,891 | ) | (4,671 | ) | (5,369 | )
| 5,088 |  | 6,307 |  | 5,610 |
Total | $ | 15,312 |  | $ | 18,656 |  | $ | 17,129 |

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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=14024403&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=14024403&loc=d3e13854-109267 + Details
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