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Goodwill and Intangible Assets | 12 Months Ended
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Dec. 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 December 31, 2022:
(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 |
2021 activity | — |  |  | — |  |  | — |  |  | — |
Goodwill as of December 31, 2021 | 205,143 |  |  | — |  |  | — |  |  | 205,143 |
Current year activity | — |  |  | — |  |  | — |  |  | — |
Goodwill as of December 31, 2022(a) | $ | 205,143 |  |  | $ | — |  |  | $ | — |  |  | $ | 205,143 |
_____________________________________________________________________________________________________________ (a)As of December 31, 2022, accumulated impairment was $867.8 million. The Company performed its annual impairment test in the fourth quarter of 2022 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, 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 December 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 |  | (25,886) |  | (23,232) |  | 20,132 |  |  | 20 years
Contractor license | 6,000 |  | — |  | (6,000) |  | — |  |  | N/A
Customer relationships | 39,800 |  | (23,155) |  | (16,645) |  | — |  |  | N/A
Construction contract backlog | 149,290 |  | (149,290) |  | — |  | — |  |  | N/A
Total | $ | 381,940 |  | $ | (198,331) |  | $ | (113,067) |  | $ | 70,542 |  |  |
| 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)(a) | 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 |  |  |
___________________________________________________________________________________________________________ (a)In 2021, the Company sold an immaterial subsidiary, which had amortizable trade names with a gross cost of $5.1 million and a carrying value of $2.6 million at the time of sale. Amortization expense related to amortizable intangible assets was $14.5 million, $35.5 million and $32.2 million for the years ended December 31, 2022, 2021 and 2020, respectively. Future amortization expense related to amortizable intangible assets will be approximately $2.2 million per year for the years 2023 through 2027, and $9.1 million thereafter. The Company performed its annual impairment test for non-amortizable trade names during the fourth quarter of 2022. 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. Other amortizable intangible assets are reviewed for impairment whenever circumstances indicate that the future cash flows generated by the assets might be less than the assets’ net carrying value. The Company had no impairment of intangible assets during the years ended December 31, 2022, 2021 or 2020.

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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 https://asc.fasb.org/topic&trid=2144416 + Details
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