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Income per Common Share (Tables)
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Schedule of computation of basic and diluted earnings per share The following table sets forth the calculation of income per share in Holdings’ condensed consolidated statements of operations and the differences between basic weighted average shares outstanding and diluted weighted average shares outstanding used to compute basic and diluted earnings per share, respectively.
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017
 
2018
 
2017
 
2018
 
(in thousands, except per share amounts)
Numerator:
 

 
 

 
 

 
 

Net income attributable to Select Medical Holdings Corporation
$
18,462

 
$
32,917

 
$
76,387

 
$
113,167

Less: Earnings allocated to unvested restricted stockholders
608

 
1,098

 
2,464

 
3,732

Net income available to common stockholders
$
17,854

 
$
31,819

 
$
73,923

 
$
109,435

Denominator:
 

 
 

 
 

 
 

Weighted average shares—basic
129,142

 
130,387

 
128,745

 
129,972

Effect of dilutive securities:
 

 
 

 
 

 
 

Stock options
180

 
60

 
171

 
94

Weighted average shares—diluted
129,322

 
130,447

 
128,916

 
130,066

Basic income per common share:
$
0.14

 
$
0.24

 
$
0.57

 
$
0.84

Diluted income per common share:
$
0.14

 
$
0.24

 
$
0.57

 
$
0.84