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Goodwill and Other Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2018
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, 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
 
41,709

 
—

 
41,709

Foreign currency translation adjustments
 
(4,699
)
 
(2,739
)
 
(7,438
)
 
 
 
 
 
 
 
Balance at March 31, 2018:
 
 
 
 
 
 
Goodwill
 
1,309,537

 
690,937

 
2,000,474

Accumulated impairment
 
—

 
(97,603
)
 
(97,603
)
 
 
$
1,309,537

 
$
593,334

 
$
1,902,871
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
 
 
March 31, 2018
 
December 31, 2017
 
March 31, 2018
 
 
Intangible
Assets
 
Accumulated
Amortization
 
Intangible
Assets, Net
 
Intangible
Assets
 
Accumulated
Amortization
 
Intangible
Assets, Net
 
Remaining Weighted Average Amortization Period in Years
Customer relationships
 
$
328,270

 
$
(143,979
)
 
$
184,291

 
$
327,334

 
$
(137,333
)
 
$
190,001

 
7.1
Backlog
 
136,483

 
(135,277
)
 
1,206

 
136,266

 
(135,847
)
 
419

 
0.9
Trade names
 
80,654

 
(18,166
)
 
62,488

 
74,797

 
(17,057
)
 
57,740

 
15.9
Non-compete agreements
 
37,754

 
(28,234
)
 
9,520

 
37,760

 
(27,659
)
 
10,101

 
3.8
Patented rights and developed technology
 
22,527

 
(18,032
)
 
4,495

 
22,529

 
(17,611
)
 
4,918

 
3.1
Curriculum
 
9,000

 
(174
)
 
8,826

 
—

 
—

 
—

 
9.8
Total intangible assets subject to amortization
 
$
614,688

 
$
(343,862
)
 
$
270,826

 
$
598,686

 
$
(335,507
)
 
$
263,179

 
9.0
Estimated Future Aggregate Amortization Expense of Intangible Assets
The estimated future aggregate amortization expense of intangible assets subject to amortization as of March 31, 2018 is set forth below (in thousands):
For the Fiscal Year Ending December 31,
 
 

Remainder of 2018
 
$
31,496

2019
 
38,878

2020
 
37,444

2021
 
35,106

2022
 
31,576

Thereafter
 
96,326

Total
 
$
270,826