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Quarterly Financial Information (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information
The following table summarizes the unaudited quarterly results of operations for 2018 and 2017 (amounts in thousands, except per share data):
 
2018 Quarters Ended (unaudited)
 
 
 
March 31
 
June 30
 
September 30
 
December 31
 
Total
Revenues
$
222,492

 
$
268,734

 
$
291,266

 
$
255,175

 
$
1,037,667

Gross profit
20,594

 
31,465

 
31,531

 
26,742

 
110,332

Income before income taxes and earnings attributable to noncontrolling interests
3,721

 
9,240

 
11,579

 
6,738

 
31,278

Net income attributable to Sterling common stockholders
$
2,489

 
$
8,176

 
$
8,915

 
$
5,607

 
$
25,187

Net income per share attributable to Sterling common stockholders:
 
 
 
 
 
 
 
 
 
Basic
$
0.09

 
$
0.30

 
$
0.33

 
$
0.22

 
$
0.94

Diluted
$
0.09

 
$
0.30

 
$
0.33

 
$
0.21

 
$
0.93


 
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