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Goodwill and Intangible Assets
 3 Months Ended
Mar. 31, 2024
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, 2024:
(in thousands)CivilBuildingSpecialty
Contractors		Total
Gross goodwill as of December 31, 2023
$492,074 $424,724 $156,193 $1,072,991 
Accumulated impairment as of December 31, 2023
(286,931)(424,724)(156,193)(867,848)
Goodwill as of December 31, 2023205,143 — — 205,143 
Current year activity— — — — 
Goodwill as of March 31, 2024$205,143 $— $— $205,143 
The Company performed its annual impairment test in the fourth quarter of 2023 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 March 31, 2024Weighted-Average Amortization Period
(in thousands)CostAccumulated
Amortization		Accumulated Impairment ChargeCarrying Value
Trade names (non-amortizable)$117,600 $— $(67,190)$50,410 Indefinite
Trade names (amortizable)69,250 (28,682)(23,232)17,336 20 years
Contractor license6,000 — (6,000)— N/A
Customer relationships39,800 (23,155)(16,645)— N/A
Construction contract backlog149,290 (149,290)— — N/A
Total$381,940 $(201,127)$(113,067)$67,746 
As of December 31, 2023Weighted-Average Amortization Period
(in thousands)CostAccumulated
Amortization		Accumulated Impairment ChargeCarrying Value
Trade names (non-amortizable)$117,600 $— $(67,190)$50,410 Indefinite
Trade names (amortizable)69,250 (28,123)(23,232)17,895 20 years
Contractor license6,000 — (6,000)— N/A
Customer relationships39,800 (23,155)(16,645)— N/A
Construction contract backlog149,290 (149,290)— — N/A
Total$381,940 $(200,568)$(113,067)$68,305 
Amortization expense related to amortizable intangible assets for both the three months ended March 31, 2024 and 2023 was $0.6 million. As of March 31, 2024, future amortization expense related to amortizable intangible assets will be approximately $1.7 million for the remainder of 2024, $2.2 million per year for the years 2025 through 2029 and $4.6 million thereafter.
The Company performed its annual impairment test for non-amortizable trade names during the fourth quarter of 2023. 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 three months ended March 31, 2024 or 2023.