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Net Income (Loss) Per Share Attributable to Sterling Common Stockholders (Tables)
 12 Months Ended
Dec. 31, 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 (loss) attributable to Sterling common stockholders (amounts in thousands, except per share data):
 
Years Ended December 31,
 
2018
 
2017
 
2016
Numerator:
 
 
 
 
 
Net income (loss) attributable to Sterling common stockholders
$
25,187

 
$
11,617

 
$
(9,238
)
Denominator:
 
 
 
 
 
Weighted average common shares outstanding — basic
26,903

 
26,274

 
23,140

Shares for dilutive unvested stock
291

 
438

 
—

Weighted average common shares outstanding and assumed conversions— diluted
27,194

 
26,712

 
23,140

Basic net income (loss) per share attributable to Sterling common stockholders
$
0.94

 
$
0.44

 
$
(0.40
)
Diluted net income (loss) per share attributable to Sterling common stockholders
$
0.93

 
$
0.43

 
$
(0.40
)