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Goodwill and Intangible Assets
 9 Months Ended
Sep. 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 September 30, 2021:
(in thousands)CivilBuildingSpecialty
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, 2020205,143 — — 205,143 
Current year activity— — — — 
Goodwill as of September 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 September 30, 2021Weighted-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)74,350 (25,620)(23,232)25,498 20 years
Contractor license6,000 — (6,000)— N/A
Customer relationships39,800 (22,868)(16,645)287 12 years
Construction contract backlog149,290 (129,016)— 20,274 3 years
Total$387,040 $(177,504)$(113,067)$96,469 
As of December 31, 2020Weighted-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)74,350 (23,754)(23,232)27,364 20 years
Contractor license6,000 — (6,000)— N/A
Customer relationships39,800 (22,103)(16,645)1,052 12 years
Construction contract backlog149,290 (105,001)— 44,289 3 years
Total$387,040 $(150,858)$(113,067)$123,115 
Amortization expense for the three and nine months ended September 30, 2021 was $9.3 million and $26.6 million, respectively. Amortization expense for the three and nine months ended September 30, 2020 was $9.3 million and $23.9 million, respectively. As of September 30, 2021, amortization expense is estimated to be $9.3 million for the remainder of 2021, $14.4 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.