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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of goodwill and intangible assets | Goodwill and intangible assets consisted of the following at December 31:
|  | 2021 |  | 2020
(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 |  | 25,841 |  |  | — |  |  | 25,841 |  |  | 25,841 |  |  | — |  |  | 25,841 |
Total goodwill |  | $ | 66,065 |  |  | $ | — |  |  | $ | 66,065 |  |  | $ | 66,065 |  |  | $ | — |  |  | $ | 66,065 |
Amortizable Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |
Backlog |  | $ | 5,289 |  |  | $ | 5,289 |  |  | $ | — |  |  | $ | 5,289 |  |  | $ | 5,289 |  |  | $ | — |
Customer relationships |  | 31,381 |  |  | 11,179 |  |  | 20,202 |  |  | 31,381 |  |  | 8,914 |  |  | 22,467 |
Trade names |  | 696 |  |  | 311 |  |  | 385 |  |  | 696 |  |  | 264 |  |  | 432 |
Indefinite-lived Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |
Trade names |  | 28,467 |  |  | — |  |  | 28,467 |  |  | 28,466 |  |  | — |  |  | 28,466 |
Total intangible assets |  | $ | 65,833 |  |  | $ | 16,779 |  |  | $ | 49,054 |  |  | $ | 65,832 |  |  | $ | 14,467 |  |  | $ | 51,365 |
Schedule of estimated future intangible asset amortization expense | As of December 31, 2021, estimated future intangible asset amortization expense for the each of the next five years and thereafter was as follows:
(in thousands) |  | Future Amortization Expense
2022 |  | $ | 2,312 |
2023 |  | 2,312 |
2024 |  | 2,312 |
2025 |  | 2,312 |
2026 |  | 2,312 |
Thereafter |  | 9,027 |
Total |  | $ | 20,587 |

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