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Net Income Per Share Attributable to Sterling Common Stockholders
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Net Income Per Share Attributable to Sterling Common Stockholders
13.
Net Income Per Share Attributable to Sterling Common Stockholders
 
The following table reconciles the numerators and denominators of the basic and diluted per common share computations for net income attributable to Sterling common stockholders (amounts in thousands, except per share data):
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
Numerator:
 

 
 

 
 

 
 

Net income attributable to Sterling common stockholders
$
8,915

 
$
7,132

 
$
19,580

 
$
8,537

Weighted average common shares outstanding — basic
26,908

 
26,486

 
26,893

 
25,787

Shares for dilutive unvested stock and warrants
387

 
434

 
281

 
473

Weighted average common shares outstanding and incremental shares assumed repurchased— diluted
27,295

 
26,920

 
27,174

 
26,260

Basic income per share attributable to Sterling common stockholders
$
0.33

 
$
0.27

 
$
0.73

 
$
0.33

Diluted income per share attributable to Sterling common stockholders
$
0.33

 
$
0.26

 
$
0.72

 
$
0.33