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Goodwill and Other Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Changes in Quanta's Goodwill
A summary of changes in Quanta’s goodwill is as follows (in thousands):
 
 
Electric Power Infrastructure Services
Division
 
Pipeline and Industrial Infrastructure Services
Division
 
Total
Balance at December 31, 2016:
 
 
 
 
 
 
Goodwill
 
$
1,253,979

 
$
388,923

 
$
1,642,902

Accumulated impairment
 

 
(39,733
)
 
(39,733
)
 
 
1,253,979

 
349,190

 
1,603,169

 
 
 
 
 
 
 
Goodwill related to acquisitions completed in 2017
 
5,866

 
296,542

 
302,408

Purchase price allocation adjustments
 
(619
)
 
(659
)
 
(1,278
)
Goodwill impaired during 2017
 

 
(57,011
)
 
(57,011
)
Foreign currency translation adjustments
 
13,301

 
8,011

 
21,312

 
 
 
 
 
 
 
Balance at December 31, 2017:
 
 
 
 
 
 
Goodwill
 
1,272,527

 
693,905

 
1,966,432

Accumulated impairment
 

 
(97,832
)
 
(97,832
)
 
 
1,272,527

 
596,073

 
1,868,600

 
 
 
 
 
 
 
Goodwill related to acquisitions completed in 2018
 
56,337

 

 
56,337

Purchase price allocation adjustments
 
51

 

 
51

Foreign currency translation adjustments
 
(15,837
)
 
(9,272
)
 
(25,109
)
 
 
 
 
 
 
 
Balance at December 31, 2018:
 
 
 
 
 
 
Goodwill
 
1,313,078
 
683,284
 
1,996,362
Accumulated impairment
 

 
(96,483
)
 
(96,483
)
 
 
1,313,078
 
586,801
 
1,899,879
 
 
 
 
 
 
 
Goodwill related to acquisitions completed in 2019
 
43,183

 
67,200

 
110,383

Purchase price allocation adjustments
 
1,503

 

 
1,503

Foreign currency translation adjustments
 
7,399

 
3,511

 
10,910

 
 
 
 
 
 
 
Balance at December 31, 2019:
 
 
 
 
 
 
Goodwill
 
1,365,163

 
753,938

 
2,119,101

Accumulated impairment
 

 
(96,426
)
 
(96,426
)
 
 
$
1,365,163

 
$
657,512

 
$
2,022,675


Other Intangible Assets
Quanta’s intangible assets and the remaining weighted average amortization periods related to its intangible assets subject to amortization were as follows (in thousands except for weighted average amortization periods, which are in years):
 
 
 
 
 
 
As of
 
 
As of
 
As of
 
December 31,
 
 
December 31, 2019
 
December 31, 2018
 
2019
 
 
Intangible
Assets
 
Accumulated
Amortization
 
Intangible
Assets, Net
 
Intangible
Assets
 
Accumulated
Amortization
 
Intangible
Assets, Net
 
Remaining Weighted Average Amortization Period in Years
Customer relationships
 
$
532,808

 
$
(213,915
)
 
$
318,893

 
$
359,967

 
$
(165,715
)
 
$
194,252

 
6.5
Backlog
 
144,704

 
(141,580
)
 
3,124

 
135,578

 
(134,592
)
 
986

 
2.8
Trade names
 
93,396

 
(26,145
)
 
67,251

 
81,058

 
(21,559
)
 
59,499

 
14.6
Non-compete agreements
 
43,281

 
(32,868
)
 
10,413

 
40,728

 
(30,168
)
 
10,560

 
3.1
Patented rights and developed technology
 
22,719

 
(20,682
)
 
2,037

 
22,482

 
(19,175
)
 
3,307

 
2.2
Curriculum
 
11,712

 
(2,696
)
 
9,016

 
9,448

 
(872
)
 
8,576

 
8.3
Total intangible assets subject to amortization
 
848,620

 
(437,886
)
 
410,734

 
649,261

 
(372,081
)
 
277,180

 
7.7
Engineering license
 
3,000

 

 
3,000

 
3,000

 

 
3,000

 
 
Total intangible assets
 
$
851,620

 
$
(437,886
)
 
$
413,734

 
$
652,261

 
$
(372,081
)
 
$
280,180

 
 

Estimated Future Aggregate Amortization Expense of Intangible Assets
The estimated future aggregate amortization expense of intangible assets subject to amortization as of December 31, 2019 is set forth below (in thousands):
Year Ending December 31:
 
 
2020
 
$
70,455

2021
 
67,804

2022
 
62,848

2023
 
54,421

2024
 
41,437

Thereafter
 
113,769

Total
 
$
410,734