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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amount of Goodwill | The following table presents the changes in the carrying amount of goodwill since its inception through December 31, 2020:
(in thousands) | Civil |  | Building |  | Specialty Contractors |  | Total
Gross goodwill as of December 31, 2018 | $ | 492,074 |  |  | $ | 424,724 |  |  | $ | 156,193 |  |  | $ | 1,072,991 |
Accumulated impairment as of December 31, 2018 | (76,716) |  |  | (411,269) |  |  | — |  |  | (487,985) |
Goodwill as of December 31, 2018 | 415,358 |  |  | 13,455 |  |  | 156,193 |  |  | 585,006 |
2019 impairment | (210,215) |  |  | (13,455) |  |  | (156,193) |  |  | (379,863) |
Goodwill as of December 31, 2019 | 205,143 |  |  | — |  |  | — |  |  | 205,143 |
Current year activity | — |  |  | — |  |  | — |  |  | — |
Goodwill as of December 31, 2020(a) | $ | 205,143 |  |  | $ | — |  |  | $ | — |  |  | $ | 205,143 |
_____________________________________________________________________________________________________________ (a)As of December 31, 2020, accumulated impairment was $867.8 million.
Schedule of Finite and Indefinite Lived Intangible Assets | Intangible assets consist of the following:
| As of December 31, 2020 |  | Weighted-Average Amortization Period
(in thousands) | Cost | Accumulated Amortization | Accumulated Impairment Charge | Carrying Value |
Trade names (non-amortizable) | $ | 117,600 |  | $ | — |  | $ | (67,190) |  | $ | 50,410 |  |  | Indefinite
Trade names (amortizable) | 74,350 |  | (23,754) |  | (23,232) |  | 27,364 |  |  | 20 years
Contractor license | 6,000 |  | — |  | (6,000) |  | — |  |  | N/A
Customer relationships | 39,800 |  | (22,103) |  | (16,645) |  | 1,052 |  |  | 12 years
Construction contract backlog | 149,290 |  | (105,001) |  | — |  | 44,289 |  |  | 3 years
Total | $ | 387,040 |  | $ | (150,858) |  | $ | (113,067) |  | $ | 123,115 |  |  |
| As of December 31, 2019 |  | Weighted-Average Amortization Period
(in thousands) | Cost | Accumulated Amortization | Accumulated Impairment Charge | Carrying Value |
Trade names (non-amortizable) | $ | 117,600 |  | $ | — |  | $ | (67,190) |  | $ | 50,410 |  |  | Indefinite
Trade names (amortizable) | 74,350 |  | (21,267) |  | (23,232) |  | 29,851 |  |  | 20 years
Contractor license | 6,000 |  | — |  | (6,000) |  | — |  |  | N/A
Customer relationships | 39,800 |  | (21,048) |  | (16,645) |  | 2,107 |  |  | 12 years
Construction contract backlog | 149,290 |  | (76,388) |  | — |  | 72,902 |  |  | 3 years
Total | $ | 387,040 |  | $ | (118,703) |  | $ | (113,067) |  | $ | 155,270 |  |  |

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