Goodwill and Intangible Assets

6 Months Ended

Jun. 30, 2019

Goodwill and Intangible Assets

Goodwill and Intangible Assets

Note 7—Goodwill and Intangible Assets

The change in goodwill by segment for the six months ended June 30, 2019 was as follows (in thousands):

	Power		Pipeline		Utilities		Transmission		Civil		Total
Balance at January 1, 2019	$	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 June 30, 2019	$	26,194	$	52,415	$	37,312	$	59,032	$	40,150	$	215,103

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

		June 30, 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	$	31,390	$	(26,923)	$	4,467	$	31,390	$	(25,156)	$	6,234
Customer relationships	16 years		97,400		(26,945)		70,455		97,400		(23,079)		74,321
Non-compete agreements	5 years		1,900		(1,390)		510		1,900		(1,387)		513
Other	3 years		275		(191)		84		275		(145)		130
Total	15 years	$	130,965	$	(55,449)	$	75,516	$	130,965	$	(49,767)	$	81,198

Amortization expense of intangible assets was $3.0 million and $2.7 million for the three months ended June 30, 2019 and 2018, respectively, and $5.7 million and $5.2 million for the six months ended June 30, 2019 and 2018, respectively. Estimated future amortization expense for intangible assets is as follows (in thousands):

	Estimated
	Intangible
	Amortization
For the Years Ending December 31,	Expense
2019 (remaining six months)	$	5,690
2020		8,814
2021		7,577
2022		6,416
2023		5,581
Thereafter		41,438
	$	75,516