Goodwill and Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in Carrying Amount of Goodwill

The following table presents the changes in the carrying amount of goodwill since its inception through September 30, 2020:

(in thousands)	Civil		Building		Specialty Contractors		Total
Gross goodwill	$	492,074	$	424,724	$	156,193	$	1,072,991
Accumulated impairment	(286,931)		(424,724)		(156,193)		(867,848)
Balance as of December 31, 2019	205,143		—		—		205,143
Current year activity	—		—		—		—
Balance as of September 30, 2020	$	205,143	$	—	$	—	$	205,143

Intangible Assets

Intangible assets consist of the following:

	As of September 30, 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		(23,133)		(23,232)		27,985		20 years
Contractor license	6,000		—		(6,000)		—		N/A
Customer relationships	39,800		(21,839)		(16,645)		1,316		12 years
Construction contract backlog	149,290		(97,610)		—		51,680		3 years
Total	$	387,040	$	(142,582)	$	(113,067)	$	131,391

	As of December 31, 2019								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		(21,267)		(23,232)		29,851		20 years
Contractor license	6,000		—		(6,000)		—		N/A
Customer relationships	39,800		(21,048)		(16,645)		2,107		12 years
Construction contract backlog	149,290		(76,388)		—		72,902		3 years
Total	$	387,040	$	(118,703)	$	(113,067)	$	155,270