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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2021
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 September 30, 2021:
(in thousands) | Civil | Building | Specialty Contractors | Total
Gross goodwill as of December 31, 2020 | $ | 492,074 |  | $ | 424,724 |  | $ | 156,193 |  | $ | 1,072,991 |
Accumulated impairment as of December 31, 2020 | (286,931) |  | (424,724) |  | (156,193) |  | (867,848) |
Goodwill as of December 31, 2020 | 205,143 |  | — |  | — |  | 205,143 |
Current year activity | — |  | — |  | — |  | — |
Goodwill as of September 30, 2021 | $ | 205,143 |  | $ | — |  | $ | — |  | $ | 205,143 |
Intangible Assets | Intangible assets consist of the following:
| As of September 30, 2021 |  | 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 |  | (25,620) |  | (23,232) |  | 25,498 |  |  | 20 years
Contractor license | 6,000 |  | — |  | (6,000) |  | — |  |  | N/A
Customer relationships | 39,800 |  | (22,868) |  | (16,645) |  | 287 |  |  | 12 years
Construction contract backlog | 149,290 |  | (129,016) |  | — |  | 20,274 |  |  | 3 years
Total | $ | 387,040 |  | $ | (177,504) |  | $ | (113,067) |  | $ | 96,469 |  |  |
| 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 |  |  |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with finite and infinite lives, by either major class or business segment. + References No definition available. + Details
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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267 + Details
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