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Net Income Per Share Attributable to Sterling Common Stockholders (Tables)
 6 Months Ended
Jun. 30, 2018
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 (amounts in thousands, except per share data):
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Numerator:
 

 
 

 
 

 
 

Net income attributable to Sterling common stockholders
$
8,176

 
$
3,662

 
$
10,663

 
$
1,405

Weighted average common shares outstanding — basic
26,887

 
26,978

 
26,881

 
25,972

Shares for dilutive unvested stock and warrants
238

 
358

 
281

 
437

Weighted average common shares outstanding and incremental shares assumed repurchased— diluted
27,125

 
27,336

 
27,162

 
26,409

Basic income per share attributable to Sterling common stockholders
$
0.30

 
$
0.14

 
$
0.40

 
$
0.05

Diluted income per share attributable to Sterling common stockholders
$
0.30

 
$
0.13

 
$
0.39

 
$
0.05