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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
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:
|  | 2017 |  | 2016
(in thousands) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
T&D |  | $ | 40,224 |  |  | $ | — |  |  | $ | 40,224 |  |  | $ | 40,224 |  |  | $ | — |  |  | $ | 40,224 |
C&I |  |  | 6,770 |  |  |  | — |  |  |  | 6,770 |  |  |  | 6,557 |  |  |  | — |  |  |  | 6,557 |
Total goodwill |  | $ | 46,994 |  |  | $ | — |  |  | $ | 46,994 |  |  | $ | 46,781 |  |  | $ | — |  |  | $ | 46,781 |
Amortizable Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Backlog |  | $ | 989 |  |  | $ | 989 |  |  | $ | — |  |  | $ | 989 |  |  | $ | 989 |  |  | $ | — |
Customer relationships |  |  | 5,277 |  |  |  | 4,069 |  |  |  | 1,208 |  |  |  | 5,266 |  |  |  | 3,590 |  |  |  | 1,676 |
Trade names |  |  | 695 |  |  |  | 125 |  |  |  | 570 |  |  |  | 695 |  |  |  | 79 |  |  |  | 616 |
Unallocated intangible assets |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 744 |  |  |  | 26 |  |  |  | 718 |
Indefinite-lived Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade names |  |  | 9,074 |  |  |  | — |  |  |  | 9,074 |  |  |  | 8,556 |  |  |  | — |  |  |  | 8,556 |
Total Intangible assets |  | $ | 16,035 |  |  | $ | 5,183 |  |  | $ | 10,852 |  |  | $ | 16,250 |  |  | $ | 4,684 |  |  | $ | 11,566 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] | As of December 31, 2017 estimated future intangible asset amortization expense for the each of the next five years and thereafter was as follows:
(In thousands) |  | Future Amortization Expense
2018 |  | $ | 443 |
2019 |  |  | 137 |
2020 |  |  | 137 |
2021 |  |  | 137 |
2022 |  |  | 137 |
Thereafter |  |  | 787 |
Total |  | $ | 1,778

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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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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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