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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2019
Goodwill and Intangible Assets |
Schedule of goodwill and intangible assets | Goodwill and intangible assets consisted of the following at December 31:
|  | 2019 |  | 2018
|  | Gross |  |  |  |  | Net |  | Gross |  |  |  |  | Net
|  | Carrying |  | Accumulated |  | Carrying |  | Carrying |  | Accumulated |  | Carrying
(in thousands) |  | Amount |  | Amortization |  | Amount |  | Amount |  | Amortization |  | Amount
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
T&D |  | $ | 40,224 |  | $ | — |  | $ | 40,224 |  | $ | 40,224 |  | $ | — |  | $ | 40,224
C&I |  |  | 25,836 |  |  | — |  |  | 25,836 |  |  | 16,364 |  |  | — |  |  | 16,364
Total goodwill |  | $ | 66,060 |  | $ | — |  | $ | 66,060 |  | $ | 56,588 |  | $ | — |  | $ | 56,588
Amortizable Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Backlog |  | $ | 5,289 |  | $ | 4,039 |  | $ | 1,250 |  | $ | 2,789 |  | $ | 1,889 |  | $ | 900
Customer relationships |  |  | 31,381 |  |  | 6,623 |  |  | 24,758 |  |  | 17,280 |  |  | 4,970 |  |  | 12,310
Trade names |  |  | 695 |  |  | 218 |  |  | 477 |  |  | 695 |  |  | 172 |  |  | 523
Indefinite-lived Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade names |  |  | 28,455 |  |  | — |  |  | 28,455 |  |  | 19,533 |  |  | — |  |  | 19,533
Total intangible assets |  | $ | 65,820 |  | $ | 10,880 |  | $ | 54,940 |  | $ | 40,297 |  | $ | 7,031 |  | $ | 33,266
Schedule of estimated future intangible asset amortization expense | As of December 31, 2019, estimated future intangible asset amortization expense for the each of the next five years and thereafter was as follows:
|  | Future
|  | Amortization
(in thousands) |  | Expense
2020 |  | $ | 3,587
2021 |  |  | 2,312
2022 |  |  | 2,312
2023 |  |  | 2,312
2024 |  |  | 2,312
Thereafter |  |  | 13,650
Total |  | $ | 26,485

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