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Segment Information (Details 3) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
An allocation of total depreciation, including depreciation of shared construction equipment, and amortization |  |  |
Depreciation and amortization | $ 29,195 | $ 25,156 | $ 19,511
T&D |  |  |
An allocation of total depreciation, including depreciation of shared construction equipment, and amortization |  |  |
Depreciation and amortization | 27,545 | 23,758 | 18,426
C&I |  |  |
An allocation of total depreciation, including depreciation of shared construction equipment, and amortization |  |  |
Depreciation and amortization | $ 1,650 | $ 1,398 | $ 1,085

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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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Period Type: | duration

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- Details
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Period Type: | duration