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Goodwill and other intangible assets (Tables) | 3 Months Ended
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Mar. 31, 2012
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, 2012 | Balance as of January 1, 2012* | Goodwill Acquired During the Year** | Balance as of March 31, 2012*
| (In thousands)
Electric | $ | — |  | $ | — |  | $ | — |
Natural gas distribution | 345,736 |  | — |  | 345,736 |
Pipeline and energy services | 9,737 |  | — |  | 9,737 |
Exploration and production | — |  | — |  | — |
Construction materials and contracting | 176,290 |  | — |  | 176,290 |
Construction services | 103,168 |  | 458 |  | 103,626 |
Other | — |  | — |  | — |
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 a purchase price adjustment that was not material related to an acquisition in a prior period.
Three Months Ended March 31, 2011 | Balance as of January 1, 2011* | Goodwill Acquired During the Year** | Balance as of March 31, 2011*
| (In thousands)
Electric | $ | — |  | $ | — |  | $ | — |
Natural gas distribution | 345,736 |  | — |  | 345,736 |
Pipeline and energy services | 9,737 |  | — |  | 9,737 |
Exploration and production | — |  | — |  | — |
Construction materials and contracting | 176,290 |  | — |  | 176,290 |
Construction services | 102,870 |  | 298 |  | 103,168 |
Other | — |  | — |  | — |
Total | $ | 634,633 |  | $ | 298 |  | $ | 634,931 |
* Balance is presented net of accumulated impairment of $12.3 million at the pipeline and energy services segment, which occurred in prior periods. ** Includes a purchase price adjustment that was not material related to an acquisition in a prior period.
Year Ended December 31, 2011 | Balance as of January 1, 2011* | Goodwill Acquired During the Year** | Balance as of December 31, 2011*
| (In thousands)
Electric | $ | — |  | $ | — |  | $ | — |
Natural gas distribution | 345,736 |  | — |  | 345,736 |
Pipeline and energy services | 9,737 |  | — |  | 9,737 |
Exploration and production | — |  | — |  | — |
Construction materials and contracting | 176,290 |  | — |  | 176,290 |
Construction services | 102,870 |  | 298 |  | 103,168 |
Other | — |  | — |  | — |
Total | $ | 634,633 |  | $ | 298 |  | $ | 634,931 |
* Balance is presented net of accumulated impairment of $12.3 million at the pipeline and energy services segment, which occurred in prior periods. ** Includes a purchase price adjustment that was not material related to an acquisition in a prior period.
Other amortizable intangible assets | Other amortizable intangible assets were as follows:
| March 31, 2012 |  | March 31, 2011 |  | December 31, 2011 |
| (In thousands)
Customer relationships | $ | 21,010 |  | $ | 21,702 |  | $ | 21,702 |
Accumulated amortization | (10,197 | ) | (8,890 | ) | (10,392 | )
| 10,813 |  | 12,812 |  | 11,310 |
Noncompete agreements | 7,086 |  | 7,685 |  | 7,685 |
Accumulated amortization | (4,921 | ) | (4,898 | ) | (5,371 | )
| 2,165 |  | 2,787 |  | 2,314 |
Other | 11,442 |  | 12,899 |  | 11,442 |
Accumulated amortization | (4,429 | ) | (4,147 | ) | (4,223 | )
| 7,013 |  | 8,752 |  | 7,219 |
Total | $ | 19,991 |  | $ | 24,351 |  | $ | 20,843 |

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- Definition Tabular disclosure of amortizable intangibles assets, in total and by major class, including the gross carrying amount and accumulated amortization. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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=6905858&loc=d3e16265-109275 Reference 3: 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=6905858&loc=d3e16323-109275 + Details
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- Definition Tabular disclosure of goodwill by reportable segment and in total. Disclosure details may include, but are not limited to, the carrying amount of goodwill, goodwill acquired during the year, goodwill impairment losses recognized, goodwill written-off due to the sale of a business unit, goodwill not yet allocated, and any other changes to goodwill. + References Reference 1: 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=6905597&loc=d3e13854-109267 Reference 2: 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=6905597&loc=d3e13816-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 47 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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