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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule Of Goodwill And Intangible Assets | Goodwill and intangible assets consisted of the following at December 31:
|  | 2018 |  |  | 2017 |
(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 |  |  | 16,364 |  |  |  | — |  |  |  | 16,364 |  |  |  | 6,770 |  |  |  | — |  |  |  | 6,770 |
Total goodwill |  | $ | 56,588 |  |  | $ | — |  |  | $ | 56,588 |  |  | $ | 46,994 |  |  | $ | — |  |  | $ | 46,994 |
Amortizable Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Backlog |  | $ | 2,789 |  |  | $ | 1,889 |  |  | $ | 900 |  |  | $ | 989 |  |  | $ | 989 |  |  | $ | — |
Customer relationships |  |  | 17,280 |  |  |  | 4,970 |  |  |  | 12,310 |  |  |  | 5,277 |  |  |  | 4,069 |  |  |  | 1,208 |
Trade names |  |  | 695 |  |  |  | 172 |  |  |  | 523 |  |  |  | 695 |  |  |  | 125 |  |  |  | 570 |
Indefinite-lived Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade names |  |  | 19,533 |  |  |  | — |  |  |  | 19,533 |  |  |  | 9,074 |  |  |  | — |  |  |  | 9,074 |
Total Intangible assets |  | $ | 40,297 |  |  | $ | 7,031 |  |  | $ | 33,266 |  |  | $ | 16,035 |  |  | $ | 5,183 |  |  | $ | 10,852 |
Schedule Of Estimated Future Intangible Asset Amortization Expense | As of December 31, 2018, estimated future intangible asset amortization expense for the each of the next five years and thereafter was as follows:
(In thousands) |  | Future Amortization Expense |
2019 |  | $ | 2,037 |
2020 |  |  | 1,137 |
2021 |  |  | 1,137 |
2022 |  |  | 1,137 |
2023 |  |  | 1,137 |
Thereafter |  |  | 7,148 |
Total |  | $ | 13,733 |

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