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Segment Information (Tables)
 9 Months Ended
Sep. 30, 2017
Segment Reporting [Abstract]  
Summarized Financial Information
Summarized financial information for Quanta’s reportable segments is presented in the following table (in thousands):
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2017
 
2016
 
2017
 
2016
Revenues:
 

 
 

 
 
 
 
Electric Power Infrastructure Services
$
1,504,752

 
$
1,222,432

 
$
4,024,983

 
$
3,568,521

Oil and Gas Infrastructure Services
1,104,555

 
819,754

 
2,962,868

 
1,979,832

Consolidated
$
2,609,307

 
$
2,042,186

 
$
6,987,851

 
$
5,548,353

Operating income (loss):
 

 
 

 
 
 
 
Electric Power Infrastructure Services
$
150,054

 
$
118,998

 
$
362,769

 
$
282,256

Oil and Gas Infrastructure Services
58,508

 
65,661

 
165,076

 
83,401

Corporate and non-allocated costs
(68,134
)
 
(54,496
)
 
(202,552
)
 
(162,731
)
Consolidated
$
140,428

 
$
130,163

 
$
325,293

 
$
202,926

Depreciation:
 

 
 

 
 
 
 
Electric Power Infrastructure Services
$
23,996

 
$
22,906

 
$
68,232

 
$
68,788

Oil and Gas Infrastructure Services
20,737

 
17,296

 
56,235

 
50,351

Corporate and non-allocated costs
3,693

 
2,476

 
11,302

 
7,468

Consolidated
$
48,426

 
$
42,678

 
$
135,769

 
$
126,607