Goodwill and Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2022

Goodwill and Intangible Assets

Schedule of goodwill by reporting unit

	Utilities		Energy/Renewables		Pipeline		Total
Balance at December 31, 2021	$	462,905	$	66,344	$	52,415	$	581,664
Goodwill acquired during the period		8,059		1,923		—		9,982
Balance at June 30, 2022	$	470,964	$	68,267	$	52,415	$	591,646

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

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

	June 30, 2022						December 31, 2021
	Gross Carrying Amount		Accumulated Amortization		Intangible assets, net		Gross Carrying Amount		Accumulated Amortization		Intangible assets, net
Tradenames	$	21,270		(20,261)		1,009	$	20,440	$	(19,675)	$	765
Customer relationships		226,227		(51,159)		175,068		215,227		(44,727)		170,500
Non-compete agreements		1,900		(1,900)		—		1,900		(1,845)		55
Total	$	249,397	$	(73,320)	$	176,077	$	237,567	$	(66,247)	$	171,320

Schedule of estimated future amortization expense for intangible assets

	Estimated
	Intangible
	Amortization
For the Years Ending December 31,	Expense
2022 (remaining six months)	$	7,144
2023		13,304
2024		12,240
2025		11,518
2026		11,068
Thereafter		120,803
	$	176,077