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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets and Goodwill [Table Text Block] | ## Goodwill and intangible assets consisted of the following at December 31:
|  | 2015 |  | 2014
(in thousands) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
T&D |  | $ | 40,567 |  |  | $ | — |  |  | $ | 40,567 |  |  | $ | 40,042 |  |  | $ | — |  |  | $ | 40,042 |
C&I |  |  | 6,557 |  |  |  | — |  |  |  | 6,557 |  |  |  | 6,557 |  |  |  | — |  |  |  | 6,557 |
Total goodwill |  |  | 47,124 |  |  |  | — |  |  |  | 47,124 |  |  |  | 46,599 |  |  |  | — |  |  |  | 46,599 |
Amortizable Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Backlog |  |  | 765 |  |  |  | 695 |  |  |  | 70 |  |  |  | 521 |  |  |  | 521 |  |  |  | — |
Customer relationships |  |  | 5,144 |  |  |  | 3,103 |  |  |  | 2,041 |  |  |  | 4,015 |  |  |  | 2,706 |  |  |  | 1,309 |
Trade names |  |  | 695 |  |  |  | — |  |  |  | 695 |  |  |  | — |  |  |  | — |  |  |  | — |
Indefinite-lived Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade names |  |  | 8,556 |  |  |  | — |  |  |  | 8,556 |  |  |  | 8,556 |  |  |  | — |  |  |  | 8,556 |
Total Intangible assets |  |  | 15,160 |  |  |  | 3,798 |  |  |  | 11,362 |  |  |  | 13,092 |  |  |  | 3,227 |  |  |  | 9,865 |
|  | $ | 62,284 |  |  | $ | 3,798 |  |  | $ | 58,486 |  |  | $ | 59,691 |  |  | $ | 3,227 |  |  | $ | 56,464 |

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- Definition Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class. + References Reference 1: 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=35741047&loc=d3e13816-109267 + Details
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