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Goodwill and Other Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Changes in Goodwill A summary of changes in Quanta’s goodwill is as follows (in thousands):
 
 
Electric Power Infrastructure Services
Division
 
Oil and Gas Infrastructure Services
Division
 
Total
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 recorded related to 2018 acquisitions
 
55,049

 
—

 
55,049

Purchase price allocation adjustments
 
51

 
—

 
51

Foreign currency translation adjustments
 
(6,875
)
 
(4,686
)
 
(11,561
)
 
 
 
 
 
 
 
Balance at September 30, 2018:
 
 
 
 
 
 
Goodwill
 
1,320,752

 
591,387

 
1,912,139

Accumulated impairment
 
—

 
—

 
—

 
 
$
1,320,752

 
$
591,387

 
$
1,912,139
Other Intangible Assets Quanta’s intangible assets and the remaining weighted average amortization periods related to Quanta’s 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
 
 
September 30, 2018
 
December 31, 2017
 
September 30, 2018
 
 
Intangible
Assets
 
Accumulated
Amortization
 
Intangible
Assets, Net
 
Intangible
Assets
 
Accumulated
Amortization
 
Intangible
Assets, Net
 
Remaining Weighted Average Amortization Period in Years
Customer relationships
 
$
354,579

 
$
(158,622
)
 
$
195,957

 
$
327,334

 
$
(137,333
)
 
$
190,001

 
6.4
Backlog
 
137,238

 
(135,657
)
 
1,581

 
136,266

 
(135,847
)
 
419

 
0.8
Trade names
 
81,834

 
(20,591
)
 
61,243

 
74,797

 
(17,057
)
 
57,740

 
15.6
Non-compete agreements
 
40,267

 
(29,691
)
 
10,576

 
37,760

 
(27,659
)
 
10,101

 
3.7
Patented rights and developed technology
 
22,516

 
(18,838
)
 
3,678

 
22,529

 
(17,611
)
 
4,918

 
2.9
Curriculum
 
9,000

 
(624
)
 
8,376

 
—

 
—

 
—

 
9.3
Total intangible assets subject to amortization
 
645,434

 
(364,023
)
 
281,411

 
598,686

 
(335,507
)
 
263,179

 
8.3
Engineering license
 
3,000

 
—

 
3,000

 
—

 
—

 
—

 
 
  Total intangible assets
 
$
648,434

 
$
(364,023
)
 
$
284,411

 
$
598,686

 
$
(335,507
)
 
$
263,179

 
 
Estimated Future Aggregate Amortization Expense of Intangible Assets The estimated future aggregate amortization expense of intangible assets subject to amortization as of September 30, 2018 is set forth below (in thousands):
For the Fiscal Year Ending December 31,
 
 

Remainder of 2018
 
$
12,307

2019
 
45,333

2020
 
43,172

2021
 
40,836

2022
 
37,307

Thereafter
 
102,456

Total
 
$
281,411