Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets

Schedule of goodwill by reporting unit

The change in goodwill by segment for 2019 and 2018 was as follows (in thousands):

	Power		Pipeline		Utilities		Transmission		Civil		Total
Balance at January 1, 2018	$	24,391	$	51,521	$	37,312	$	—	$	40,150	$	153,374
Goodwill acquired during the year		1,542		764		—		50,479		—		52,785
Balance at December 31, 2018	$	25,933	$	52,285	$	37,312	$	50,479	$	40,150	$	206,159
Adjustments to identifiable assets acquired and liabilities assumed		261		130		—		8,553		—		8,944
Balance at December 31, 2019	$	26,194	$	52,415	$	37,312	$	59,032	$	40,150	$	215,103

Summary of intangible asset categories, amounts and the average amortization periods

The table below summarizes the intangible asset categories, amounts and the average amortization periods, which are generally on a straight-line basis (in thousands):

		December 31, 2019						December 31, 2018
	Weighted Average Life	Gross Carrying Amount		Accumulated Amortization		Intangible assets, net		Gross Carrying Amount		Accumulated Amortization		Intangible assets, net
Tradename	9 years	$	16,040	$	(13,216)	$	2,824	$	31,390	$	(25,156)	$	6,234
Customer relationships	17 years		91,000		(24,353)		66,647		97,400		(23,079)		74,321
Non-compete agreements	5 years		1,900		(1,580)		320		1,900		(1,387)		513
Other	3 years		275		(237)		38		275		(145)		130
Total	16 years	$	109,215	$	(39,386)	$	69,829	$	130,965	$	(49,767)	$	81,198

Schedule of estimated future amortization expense for intangible assets

Estimated future amortization expense for intangible assets as of December 31, 2019 is as follows (in thousands):

	Estimated
	Intangible
	Amortization
For the Years Ending December 31,	Expense
2020	$	8,817
2021		7,577
2022		6,416
2023		5,581
2024		4,862
Thereafter		36,576
	$	69,829