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Goodwill and Other Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2017
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
 
Oil and Gas 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 acquired during 2017
5,866

 
305,537

 
311,403

Purchase price allocation adjustments
(619
)
 
(659
)
 
(1,278
)
Foreign currency translation adjustments
14,767

 
8,984

 
23,751

 
 
 
 
 
 
Balance at September 30, 2017:
 
 
 
 
 
     Goodwill
1,273,993

 
703,918

 
1,977,911

     Accumulated impairment
—

 
(40,866
)
 
(40,866
)
 
$
1,273,993

 
$
663,052

 
$
1,937,045
Other Intangible Assets
Quanta’s intangible assets subject to amortization and the remaining weighted average amortization periods related to such assets were as follows (in thousands except for weighted average amortization periods, which are in years):
 
As of
 
As of
 
As of
 
September 30, 2017
 
December 31, 2016
 
September 30, 2017
 
Intangible
Assets
 
Accumulated
Amortization
 
Intangible
Assets, Net
 
Intangible
Assets
 
Accumulated
Amortization
 
Intangible
Assets, Net
 
Remaining Weighted Average Amortization Period in Years
Customer relationships
$
328,087

 
$
(129,000
)
 
$
199,087

 
$
244,329

 
$
(110,640
)
 
$
133,689

 
7.6
Backlog
136,529

 
(135,807
)
 
722

 
133,592

 
(132,441
)
 
1,151

 
1.0
Trade names
74,833

 
(15,929
)
 
58,904

 
54,723

 
(12,855
)
 
41,868

 
16.4
Non-compete agreements
37,906

 
(26,967
)
 
10,939

 
29,212

 
(25,546
)
 
3,666

 
4.2
Patented rights and developed technology
22,542

 
(17,176
)
 
5,366

 
22,480

 
(15,831
)
 
6,649

 
3.6
Total intangible assets subject to amortization
$
599,897

 
$
(324,879
)
 
$
275,018

 
$
484,336

 
$
(297,313
)
 
$
187,023

 
9.2
Estimated Future Aggregate Amortization Expense of Intangible Assets
The estimated future aggregate amortization expense of intangible assets subject to amortization as of September 30, 2017 is set forth below (in thousands):
For the Fiscal Year Ending December 31,
 

Remainder of 2017
$
10,142

2018
39,381

2019
37,229

2020
35,824

2021
33,478

Thereafter
118,964

Total
$
275,018