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Earnings Per Share (Tables)
 3 Months Ended
Mar. 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 three months ended March 31 follows (in thousands, except per share data):
 
 
 
Three Months Ended
March 31,
 
 
2019
 
2018
Net income
 
$
172,107

 
$
174,937

Denominator for basic earnings per share
 
85,941

 
89,765

Dilutive securities
 
3,303

 
3,485

Denominator for diluted earnings per share
 
89,244


93,250

Basic earnings per share
 
$
2.00

 
$
1.95

Diluted earnings per share
 
$
1.93

 
$
1.88