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Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Computation of Basic Earnings and Diluted Earnings Per Share Data
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,
 
 
2017
 
2016
 
2017
 
2016
Numerator for basic and diluted earnings per share:
 
 
 
 
 
 
 
 
Net income
 
$
31,578

 
$
25,007

 
$
63,884

 
$
43,231

Denominator:
 
 

 
 

 


 


Weighted-average basic common shares outstanding
 
37,154

 
36,160

 
37,144

 
36,316

Assumed conversion of dilutive securities:
 
 
 
 
 

 

Stock options
 
2,047

 
2,579

 
2,067

 
2,550

Denominator for diluted earnings per share
   - Adjusted weighted-average shares
 
39,201

 
38,739

 
39,211

 
38,866

Earnings per common share:
 
 

 
 

 


 


Basic
 
$
0.85

 
$
0.69

 
$
1.72

 
$
1.19

Diluted
 
$
0.81

 
$
0.65

 
$
1.63

 
$
1.11