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Earnings Per Share (Tables)
 9 Months Ended
Sep. 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 September 30,
 
Nine months ended September 30,
 
 
2017
 
2016
 
2017
 
2016
Numerator for basic and diluted earnings per share:
 
 
 
 
 
 
 
 
Net income
 
$
38,263

 
$
35,430

 
$
102,147

 
$
78,661

Denominator:
 
 

 
 

 


 


Weighted-average basic common shares outstanding
 
37,391

 
36,433

 
37,238

 
36,438

Assumed conversion of dilutive securities:
 
 
 
 
 

 

Stock options
 
1,951

 
2,629

 
2,028

 
2,576

Denominator for diluted earnings per share
   - Adjusted weighted-average shares
 
39,342

 
39,062

 
39,266

 
39,014

Earnings per common share:
 
 

 
 

 


 


Basic
 
$
1.02

 
$
0.97

 
$
2.74

 
$
2.16

Diluted
 
$
0.97

 
$
0.91

 
$
2.60

 
$
2.02