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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Summary of Earnings Per Share, Basic and Diluted
The calculation and reconciliation of basic and diluted earnings per share for the years ended December 31 (in thousands, except per share data) follows:
 
 
 
2019
 
2018
 
2017
Net income
 
$
895,073

 
$
811,483

 
$
740,200

Denominator for basic earnings per share
 
86,401

 
88,750

 
91,129

Dilutive securities
 
3,669

 
3,401

 
2,465

Denominator for diluted earnings per share
 
90,070


92,151


93,594

Basic earnings per share
 
$
10.36

 
$
9.14

 
$
8.12

Diluted earnings per share
 
9.94

 
8.81

 
7.91