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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2019
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 attributable to Sterling common stockholders:  
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2019
 
2018
 
2019
 
2018
Numerator:
 

 
 

 
 

 
 

Net income attributable to Sterling common stockholders
$
7,957

 
$
8,917

 
$
17,600

 
$
19,580

Denominator:
 
 
 
 
 
 
 
Weighted average common shares outstanding — basic
26,365

 
26,908

 
26,359

 
26,893

Shares for dilutive unvested stock and warrants
272

 
387

 
302

 
281

Weighted average common shares outstanding — diluted
26,637

 
27,295

 
26,661

 
27,174

Basic net income per share attributable to Sterling common stockholders
$
0.30

 
$
0.33

 
$
0.67

 
$
0.73

Diluted net income per share attributable to Sterling common stockholders
$
0.30

 
$
0.33

 
$
0.66

 
$
0.72