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Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule Of Intangible Assets And Goodwill [Line Items] |  |
Goodwill gross carrying amount | $ 47,124 | $ 46,599
Goodwill accumulated amortization | 0 | 0
Goodwill net carrying amount | 47,124 | 46,599
Accumulated Amortization | 3,798 | 3,227
Intangible Assets, Gross (Excluding Goodwill) | 15,160 | 13,092
Intangible Assets, Net (Excluding Goodwill) | 11,362 | 9,865
Gross carrying amount of goodwill and intangible assets | 62,284 | 59,691
Net carrying amount of goodwill and intangible assets | 58,486 | 56,464
T&D [Member] |  |
Schedule Of Intangible Assets And Goodwill [Line Items] |  |
Goodwill gross carrying amount | 40,567 | 40,042
Goodwill accumulated amortization | 0 | 0
Goodwill net carrying amount | 40,567 | 40,042
C&I [Member] |  |
Schedule Of Intangible Assets And Goodwill [Line Items] |  |
Goodwill gross carrying amount | 6,557 | 6,557
Goodwill accumulated amortization | 0 | 0
Goodwill net carrying amount | 6,557 | 6,557
Backlog [Member] |  |
Schedule Of Intangible Assets And Goodwill [Line Items] |  |
Amortizable intangible assets gross carrying amount | 765 | 521
Accumulated Amortization | 695 | 521
Amortizable intangible assets net carrying amount | 70 | 0
Customer Relationships [Member] |  |
Schedule Of Intangible Assets And Goodwill [Line Items] |  |
Amortizable intangible assets gross carrying amount | 5,144 | 4,015
Accumulated Amortization | 3,103 | 2,706
Amortizable intangible assets net carrying amount | 2,041 | 1,309
Trade Names [Member] |  |
Schedule Of Intangible Assets And Goodwill [Line Items] |  |
Amortizable intangible assets gross carrying amount | 695 | 0
Accumulated Amortization | 0 | 0
Amortizable intangible assets net carrying amount | 695 | 0
Indefinite-lived Intangible Assets | $ 8,556 | $ 8,556

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