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Quarterly Financial Information (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information
The following table summarizes the unaudited quarterly results of operations for 2017 and 2016 (amounts in thousands, except per share data):
 
2017 Quarters Ended (unaudited)
 
 
 
March 31
 
June 30
 
September 30
 
December 31
 
Total
Revenues
$
153,416

 
$
246,412

 
$
304,219

 
$
253,911

 
$
957,958

Gross profit
9,287

 
25,205

 
30,631

 
23,969

 
89,092

Income (loss) before income taxes and earnings attributable to noncontrolling interests
(1,859
)
 
4,661

 
9,170

 
3,963

 
15,935

Net income (loss) attributable to Sterling common stockholders
(2,257
)
 
3,662

 
7,132

 
3,080

 
11,617

Net income (loss) per share attributable to Sterling common stockholders:
 
 
 
 
 
 
 
 
 
Basic
$
(0.09
)
 
$
0.14

 
$
0.27

 
$
0.11

 
$
0.44

Diluted
$
(0.09
)
 
$
0.13

 
$
0.26

 
$
0.11

 
$
0.43


 
2016 Quarters Ended (unaudited)
 
 
 
March 31
 
June 30
 
September 30
 
December 31
 
Total
Revenues
$
126,567

 
$
189,582

 
$
205,629

 
$
168,345

 
$
690,123

Gross profit
3,548

 
15,543

 
16,622

 
6,345

 
42,058

Income (loss) before income taxes and earnings attributable to noncontrolling interests
(7,336
)
 
2,570

 
3,196

 
(5,754
)
 
(7,324
)
Net income (loss) attributable to Sterling common stockholders
(7,328
)
 
2,023

 
2,415

 
(6,348
)
 
(9,238
)
Net income (loss) per share attributable to Sterling common stockholders:
 
 
 
 
 
 
 
 
 
Basic and diluted
$
(0.37
)
 
$
0.09

 
$
0.10

 
$
(0.25
)
 
$
(0.40
)