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Earnings Per Share (Tables)
 6 Months Ended
Jun. 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 June 30,
 
Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
Numerator:
 

 
 

 
 

 
 

Net income attributable to Sterling common stockholders
$
7,828

 
$
8,174

 
$
9,643

 
$
10,663

Denominator:
 
 
 
 
 
 
 
Weighted average common shares outstanding — basic
26,338

 
26,887

 
26,357

 
26,881

Shares for dilutive unvested stock and warrants
285

 
238

 
300

 
281

Weighted average common shares outstanding — diluted
26,623

 
27,125

 
26,657

 
27,162

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

 
$
0.30

 
$
0.37

 
$
0.40

Diluted net income per share attributable to Sterling common stockholders
$
0.29

 
$
0.30

 
$
0.36

 
$
0.39