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Segment Information (Tables)
 12 Months Ended
Dec. 31, 2017
Segment Reporting [Abstract]  
Summarized Financial Information
Summarized financial information for Quanta’s reportable segments is presented in the following table (in thousands):
 
 
Year Ended December 31,
 
 
2017
 
2016
 
2015
Revenues:
 
 

 
 

 
 

Electric Power Infrastructure Services
 
$
5,599,836

 
$
4,850,495

 
$
4,937,289

Oil and Gas Infrastructure Services
 
3,866,642

 
2,800,824

 
2,635,147

Consolidated
 
$
9,466,478

 
$
7,651,319

 
$
7,572,436

Operating income (loss):
 
 

 
 

 
 

Electric Power Infrastructure Services
 
$
518,130

 
$
395,745

 
$
362,328

Oil and Gas Infrastructure Services
 
184,083

 
149,502

 
142,929

Corporate and non-allocated costs
 
(323,364
)
 
(224,434
)
 
(267,754
)
Consolidated
 
$
378,849

 
$
320,813

 
$
237,503

Depreciation:
 
 

 
 

 
 

Electric Power Infrastructure Services
 
$
91,708

 
$
91,269

 
$
89,150

Oil and Gas Infrastructure Services
 
76,355

 
67,374

 
65,315

Corporate and non-allocated costs
 
15,745

 
11,597

 
8,380

Consolidated
 
$
183,808

 
$
170,240

 
$
162,845