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Goodwill and Intangible Assets | 12 Months Ended
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Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | Goodwill and Intangible Assets Goodwill and intangible assets consisted of the following at December 31:
|  | 2023 |  | 2022
(in thousands) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Goodwill |  |  |  |  |  |  |  |  |  |  |  |
T&D |  | $ | 93,240 |  |  | $ | — |  |  | $ | 93,240 |  |  | $ | 93,240 |  |  | $ | — |  |  | $ | 93,240 |
C&I |  | 25,830 |  |  | — |  |  | 25,830 |  |  | 25,830 |  |  | — |  |  | 25,830 |
Foreign currency translation |  | (2,117) |  |  | — |  |  | (2,117) |  |  | (3,223) |  |  | — |  |  | (3,223) |
Total goodwill |  | $ | 116,953 |  |  | $ | — |  |  | $ | 116,953 |  |  | $ | 115,847 |  |  | $ | — |  |  | $ | 115,847 |
Amortizable Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |
Backlog |  | $ | 9,296 |  |  | $ | 9,296 |  |  | $ | — |  |  | $ | 9,296 |  |  | $ | 9,296 |  |  | $ | — |
Customer relationships |  | 71,139 |  |  | 20,905 |  |  | 50,234 |  |  | 71,138 |  |  | 16,094 |  |  | 55,044 |
Trade names |  | 695 |  |  | 403 |  |  | 292 |  |  | 695 |  |  | 357 |  |  | 338 |
Below market lease |  | 511 |  |  | 200 |  |  | 311 |  |  | 511 |  |  | 102 |  |  | 409 |
Foreign currency translation |  | (1,768) |  |  | (270) |  |  | (1,498) |  |  | (2,689) |  |  | (410) |  |  | (2,279) |
Indefinite-lived Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |
Trade names |  | 34,412 |  |  | — |  |  | 34,412 |  |  | 34,412 |  |  | — |  |  | 34,412 |
Foreign currency translation |  | (235) |  |  | — |  |  | (235) |  |  | (367) |  |  | — |  |  | (367) |
Total intangible assets |  | $ | 114,050 |  |  | $ | 30,534 |  |  | $ | 83,516 |  |  | $ | 112,996 |  |  | $ | 25,439 |  |  | $ | 87,557 |
Customer relationships, amortizable trade names and backlog are being amortized on a straight-line method over an estimated useful life ranging up to 15 years and the remaining life of the contract, respectively, and have been determined to have no residual value. Certain trade names have indefinite lives and, therefore, are not being amortized. Intangible asset amortization expense was $4.9 million, $9.0 million and $2.3 million for the years ended December 31, 2023, 2022 and 2021, respectively. As of December 31, 2023, estimated future intangible asset amortization expense for the each of the next five years and thereafter was as follows:
(in thousands) |  | Future Amortization Expense
2024 |  | $ | 4,954 |
2025 |  | 4,954 |
2026 |  | 4,954 |
2027 |  | 4,815 |
2028 |  | 4,805 |
Thereafter |  | 24,857 |
Total |  | $ | 49,339 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 350 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//350/tableOfContent + Details
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