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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Computation of reconciliation of basic earnings per share to diluted earnings per share
The following table details the reconciliation of basic earnings per share to diluted earnings per share:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2018
 
2017
 
2018
 
2017
 
 
 
 
As Adjusted
 
 
 
As Adjusted
Numerator for basic and diluted earnings per share:
 
 
 
 
 
 
 
 
Net income
 
$
39,161

 
$
31,770

 
$
76,986

 
$
64,539

Denominator:
 
 

 
 

 


 


Weighted-average basic common shares outstanding
 
38,390

 
37,154

 
38,416

 
37,144

Assumed conversion of dilutive securities:
 
 
 
 
 

 

Stock options
 
1,834

 
2,047

 
1,834

 
2,067

Denominator for diluted earnings per share
   - Adjusted weighted-average shares
 
40,224

 
39,201

 
40,250

 
39,211

Earnings per common share:
 
 

 
 

 


 


Basic
 
$
1.02

 
$
0.86

 
$
2.00

 
$
1.74

Diluted
 
$
0.97

 
$
0.81

 
$
1.91

 
$
1.65