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Goodwill and Intangible Assets | 6 Months Ended
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Jun. 30, 2021
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 June 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 June 30, 2021 | $ | 205,143 |  | $ | — |  | $ | — |  | $ | 205,143 |
The Company tests the goodwill allocated to its Civil reporting unit for impairment annually on October 1, or more frequently if events or circumstances indicate it is more likely than not that the fair value of the reporting unit is less than its carrying amount. The Company performed its annual impairment test in the fourth quarter of 2020 using a weighted-average of an income and a market approach. These approaches utilize various valuation assumptions, and small changes to the assumptions could have a significant impact on the concluded fair value. Based on this assessment, the Company concluded goodwill was not impaired since the estimated fair value of the Civil reporting unit exceeded its carrying value. 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 June 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 |  | (24,998) |  | (23,232) |  | 26,120 |  |  | 20 years
Contractor license | 6,000 |  | — |  | (6,000) |  | — |  |  | N/A
Customer relationships | 39,800 |  | (22,630) |  | (16,645) |  | 525 |  |  | 12 years
Construction contract backlog | 149,290 |  | (120,544) |  | — |  | 28,746 |  |  | 3 years
Total | $ | 387,040 |  | $ | (168,172) |  | $ | (113,067) |  | $ | 105,801 |  |  |
| 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 |  |  |
Amortization expense for the three and six months ended June 30, 2021 was $10.7 million and $17.3 million, respectively. Amortization expense for the three and six months ended June 30, 2020 was $8.8 million and $14.6 million, respectively. As of June 30, 2021, amortization expense is estimated to be $18.1 million for the remainder of 2021, $14.9 million in 2022, $2.5 million per year for the years 2023 through 2026 and $12.4 million thereafter. The Company performed its annual impairment test for non-amortizable trade names during the fourth quarter of 2020. 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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