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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Computation of Basic Earnings and Diluted Earnings Per Share Data
Basic earnings and diluted earnings per share data were computed as follows:
 
Years Ended December 31,
 
2019
 
2018
 
2017
Numerator for basic and diluted earnings per share:
 
 
 
 
 
Net income
$
146,527

 
$
147,462

 
$
169,571

Denominator:
 

 
 

 
 

Weighted-average basic common shares outstanding
38,640

 
38,445

 
37,273

Assumed conversion of dilutive securities:
 
 
 
 
 
Stock options
1,465

 
1,678

 
1,973

Denominator for diluted earnings per share
   - Adjusted weighted-average shares
40,105

 
40,123

 
39,246

Earnings per common share:
 

 
 

 
 

Basic
$
3.79

 
$
3.84

 
$
4.55

Diluted
$
3.65

 
$
3.68

 
$
4.32