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Goodwill and Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2021
Goodwill and Intangible Assets  
Schedule of goodwill by reporting unit

Utilities

Energy/Renewables

Pipeline

Total

Balance at December 31, 2020

$

96,344

$

66,344

$

52,415

$

215,103

Goodwill acquired during the period

 

366,561

366,561

Balance at December 31, 2021

$

462,905

$

66,344

$

52,415

$

581,664

There were no changes in goodwill balances during the year ended December 31, 2020.

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

    

Utilities

    

Energy/Renewables

Pipeline

    

Total

 

Balance at January 1, 2019

$

87,791

$

66,083

$

52,285

$

206,159

Goodwill acquired during the period

 

8,553

 

261

 

130

 

8,944

Balance at December 31, 2019

$

96,344

$

66,344

$

52,415

$

215,103

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

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

December 31, 2021

December 31, 2020

Gross Carrying
Amount

    

Accumulated
Amortization

    

Intangible assets, net

    

Gross Carrying
Amount

    

Accumulated
Amortization

    

Intangible assets, net

Tradename

$

20,440

(19,675)

765

$

16,040

$

(14,793)

$

1,247

Customer relationships

 

215,227

(44,727)

170,500

 

91,000

 

(31,400)

 

59,600

Non-compete agreements

 

1,900

(1,845)

55

 

1,900

 

(1,735)

 

165

Total

$

237,567

$

(66,247)

$

171,320

$

108,940

$

(47,928)

$

61,012

Schedule of estimated future amortization expense for intangible assets

Estimated future amortization expense for intangible assets as of December 31, 2021 is as follows (in thousands):

Estimated

Intangible

Amortization

For the Years Ending December 31, 

    

Expense

2022

$

13,427

2023

12,409

2024

 

11,690

2025

 

10,968

2026

 

10,518

Thereafter

 

112,308

$

171,320