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Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule Of Intangible Assets And Goodwill [Line Items] |  |
Goodwill gross carrying amount | $ 46,994 | $ 46,781
Goodwill accumulated amortization | 0 | 0
Goodwill net carrying amount | 46,994 | 46,781
Accumulated Amortization | 5,183 | 4,684
Amortizable intangible assets net carrying amount | 1,778 |
Intangible Assets, Gross (Excluding Goodwill) | 16,035 | 16,250
Intangible Assets, Net (Excluding Goodwill) | 10,852 | 11,566
T&D [Member] |  |
Schedule Of Intangible Assets And Goodwill [Line Items] |  |
Goodwill gross carrying amount | 40,224 | 40,224
Goodwill accumulated amortization | 0 | 0
Goodwill net carrying amount | 40,224 | 40,224
C&I [Member] |  |
Schedule Of Intangible Assets And Goodwill [Line Items] |  |
Goodwill gross carrying amount | 6,770 | 6,557
Goodwill accumulated amortization | 0 | 0
Goodwill net carrying amount | 6,770 | 6,557
Backlog [Member] |  |
Schedule Of Intangible Assets And Goodwill [Line Items] |  |
Amortizable intangible assets gross carrying amount | 989 | 989
Accumulated Amortization | 989 | 989
Amortizable intangible assets net carrying amount | 0 | 0
Customer Relationships [Member] |  |
Schedule Of Intangible Assets And Goodwill [Line Items] |  |
Amortizable intangible assets gross carrying amount | 5,277 | 5,266
Accumulated Amortization | 4,069 | 3,590
Amortizable intangible assets net carrying amount | 1,208 | 1,676
Trade Names [Member] |  |
Schedule Of Intangible Assets And Goodwill [Line Items] |  |
Amortizable intangible assets gross carrying amount | 695 | 695
Accumulated Amortization | 125 | 79
Amortizable intangible assets net carrying amount | 570 | 616
Indefinite-lived Intangible Assets | 9,074 | 8,556
Intangible Assets, Gross (Excluding Goodwill) | 0 | 0
Intangible Assets, Net (Excluding Goodwill) | 9,074 | 8,556
Unallocated Intangible Assets [Member] |  |
Schedule Of Intangible Assets And Goodwill [Line Items] |  |
Amortizable intangible assets gross carrying amount | 0 | 744
Accumulated Amortization | 0 | 26
Amortizable intangible assets net carrying amount | $ 0 | $ 718

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