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Goodwill and Intangible Assets - Summary of Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Goodwill |  |
Gross Carrying Amount | $ 66,065 | $ 66,060
Accumulated Amortization | 0 | 0
Net Carrying Amount | 66,065 | 66,060
Amortizable Intangible Assets |  |
Accumulated Amortization | 14,467 | 10,880
Net Carrying Amount | 22,899 |
Total intangible assets, Gross Carrying Amount | 65,832 | 65,820
Total intangible assets, Net Carrying Amount | 51,365 | 54,940
Trade names |  |
Amortizable Intangible Assets |  |
Indefinite-lived Intangible Assets | 28,466 | 28,455
Backlog |  |
Amortizable Intangible Assets |  |
Gross Carrying Amount | 5,289 | 5,289
Accumulated Amortization | 5,289 | 4,039
Net Carrying Amount | 0 | 1,250
Customer relationships |  |
Amortizable Intangible Assets |  |
Gross Carrying Amount | 31,381 | 31,381
Accumulated Amortization | 8,914 | 6,623
Net Carrying Amount | 22,467 | 24,758
Trade names |  |
Amortizable Intangible Assets |  |
Gross Carrying Amount | 696 | 695
Accumulated Amortization | 264 | 218
Net Carrying Amount | 432 | 477
T&D |  |
Goodwill |  |
Gross Carrying Amount | 40,224 | 40,224
Accumulated Amortization | 0 | 0
Net Carrying Amount | 40,224 | 40,224
C&I |  |
Goodwill |  |
Gross Carrying Amount | 25,841 | 25,836
Accumulated Amortization | 0 | 0
Net Carrying Amount | $ 25,841 | $ 25,836

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