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Goodwill and Intangible Assets | 12 Months Ended
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Dec. 31, 2020
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:
|  | 2020 |  | 2019
(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 |  |  | 25,836 |  |  | — |  |  | 25,836 |
Total goodwill |  | $ | 66,065 |  |  | $ | — |  |  | $ | 66,065 |  |  | $ | 66,060 |  |  | $ | — |  |  | $ | 66,060 |
Amortizable Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |
Backlog |  | $ | 5,289 |  |  | $ | 5,289 |  |  | $ | — |  |  | $ | 5,289 |  |  | $ | 4,039 |  |  | $ | 1,250 |
Customer relationships |  | 31,381 |  |  | 8,914 |  |  | 22,467 |  |  | 31,381 |  |  | 6,623 |  |  | 24,758 |
Trade names |  | 696 |  |  | 264 |  |  | 432 |  |  | 695 |  |  | 218 |  |  | 477 |
Indefinite-lived Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |
Trade names |  | 28,466 |  |  | — |  |  | 28,466 |  |  | 28,455 |  |  | — |  |  | 28,455 |
Total intangible assets |  | $ | 65,832 |  |  | $ | 14,467 |  |  | $ | 51,365 |  |  | $ | 65,820 |  |  | $ | 10,880 |  |  | $ | 54,940 |
Customer relationships and backlog are being amortized on a straight-line method over an estimated useful life ranging up to 12.5 years and the remaining life of the contract, respectively, and have been determined to have no residual value. Amortizable trade names are being amortized on a straight-line basis over an estimated useful life of approximately 15 years. Certain trade names have indefinite lives and, therefore, are not being amortized. Intangible asset amortization expense was $3.6 million, $3.8 million and $1.8 million for the years ended December 31, 2020, 2019 and 2018, respectively. Immaterial foreign currency translation adjustments related to goodwill and intangible assets are netted with the amounts indicated above. As of December 31, 2020, estimated future intangible asset amortization expense for the each of the next five years and thereafter was as follows:
(in thousands) |  | Future Amortization Expense
2021 |  | $ | 2,312 |
2022 |  | 2,312 |
2023 |  | 2,312 |
2024 |  | 2,312 |
2025 |  | 2,312 |
Thereafter |  | 11,339 |
Total |  | $ | 22,899 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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