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Segment Information (Details 2) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Depreciation and amortization | $ 38,576 | $ 39,122 | $ 38,029
T&D [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and amortization | 34,990 | 35,947 | 35,456
C&I [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and amortization | $ 3,586 | $ 3,175 | $ 2,573

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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=98514028&loc=d3e3602-108585 + Details
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- Details
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