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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
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:
 
 
 
2018
 
2017
 
2016
Net income
 
$
811,483

 
$
740,200

 
$
452,385

Denominator for basic earnings per share
 
88,750

 
91,129

 
92,597

Dilutive securities
 
3,401

 
2,465

 
2,616

Denominator for diluted earnings per share
 
92,151


93,594


95,213

Basic earnings per share
 
$
9.14

 
$
8.12

 
$
4.89

Diluted earnings per share
 
8.81

 
7.91

 
4.75