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Goodwill and Intangible Assets | 3 Months Ended
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Mar. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | Goodwill and Intangible Assets Goodwill The following table presents the changes in the carrying amount of goodwill since its inception through March 31, 2022:
(in thousands) | Civil | Building | Specialty Contractors | Total
Gross goodwill as of December 31, 2021 | $ | 492,074 |  | $ | 424,724 |  | $ | 156,193 |  | $ | 1,072,991 |
Accumulated impairment as of December 31, 2021 | (286,931) |  | (424,724) |  | (156,193) |  | (867,848) |
Goodwill as of December 31, 2021 | 205,143 |  | — |  | — |  | 205,143 |
Current year activity | — |  | — |  | — |  | — |
Goodwill as of March 31, 2022 | $ | 205,143 |  | $ | — |  | $ | — |  | $ | 205,143 |
The Company performed its annual impairment test in the fourth quarter of 2021 and concluded goodwill was not impaired. In addition, the Company determined that no triggering events occurred and no circumstances changed since the date of our annual impairment test that would more likely than not reduce the fair value of the Civil reporting unit below its carrying amount. The Company will continue to monitor events and circumstances for changes that indicate the Civil reporting unit goodwill would need to be reevaluated for impairment during future interim periods prior to the annual impairment test. These future events and circumstances include, but are not limited to, changes in the overall financial performance of the Civil reporting unit, impacts to our business as a result of the COVID-19 pandemic, as well as other quantitative and qualitative factors which could indicate potential triggering events for possible impairment. Intangible Assets Intangible assets consist of the following:
| As of March 31, 2022 |  | 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) | 69,250 |  | (24,209) |  | (23,232) |  | 21,809 |  |  | 20 years
Contractor license | 6,000 |  | — |  | (6,000) |  | — |  |  | N/A
Customer relationships | 39,800 |  | (23,114) |  | (16,645) |  | 41 |  |  | 12 years
Construction contract backlog | 149,290 |  | (141,987) |  | — |  | 7,303 |  |  | 3 years
Total | $ | 381,940 |  | $ | (189,310) |  | $ | (113,067) |  | $ | 79,563 |  |  |
| As of December 31, 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) | 69,250 |  | (23,650) |  | (23,232) |  | 22,368 |  |  | 20 years
Contractor license | 6,000 |  | — |  | (6,000) |  | — |  |  | N/A
Customer relationships | 39,800 |  | (23,053) |  | (16,645) |  | 102 |  |  | 12 years
Construction contract backlog | 149,290 |  | (137,102) |  | — |  | 12,188 |  |  | 3 years
Total | $ | 381,940 |  | $ | (183,805) |  | $ | (113,067) |  | $ | 85,068 |  |  |
Amortization expense for the three months ended March 31, 2022 and 2021 was $5.5 million and $6.6 million, respectively. As of March 31, 2022, future amortization expense is estimated to be $9.0 million for the remainder of 2022, $2.2 million per year for the years 2023 through 2027 and $9.2 million thereafter. The Company performed its annual impairment test for non-amortizable trade names during the fourth quarter of 2021. Based on this assessment, the Company concluded that its non-amortizable trade names were not impaired. In addition, the Company determined that no triggering events occurred and no circumstances changed since the date of our annual impairment test that would indicate impairment of its non-amortizable trade names.

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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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