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Net Income (Loss) Per Share Attributable to Sterling Common Stockholders (Tables)
 9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following table reconciles the numerators and denominators of the basic and diluted per common share computations for net income (loss) attributable to Sterling common stockholders (amounts in thousands, except per share data):
 
 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
 
2017
 
2016
 
2017
 
2016
Numerator:
 
 

 
 

 
 

 
 

Net income (loss) attributable to Sterling common stockholders
 
$
7,132

 
$
2,415

 
$
8,537

 
$
(2,890
)
Weighted average common shares outstanding — basic
 
26,486

 
25,003

 
25,787

 
23,915

Shares for dilutive unvested stock and warrants
 
434

 
362

 
473

 
—

Weighted average common shares outstanding and incremental shares assumed repurchased— diluted
 
26,920

 
25,365

 
26,260

 
23,915

Basic income (loss) per share attributable to Sterling common stockholders
 
$
0.27

 
$
0.10

 
$
0.33

 
$
(0.12
)
Diluted income (loss) per share attributable to Sterling common stockholders
 
$
0.26

 
$
0.10

 
$
0.33

 
$
(0.12
)