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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 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 three and nine month periods ended September 30 follows (in thousands, except per share data):
 
 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
 
2018
 
2017
 
2018
 
2017
Net income
 
$
157,694

 
$
202,823

 
$
509,483

 
$
457,503

Denominator for basic earnings per share
 
88,456

 
90,751

 
89,126

 
91,619

Dilutive securities
 
3,625

 
2,250

 
3,545

 
2,304

Denominator for diluted earnings per share
 
92,081


93,001


92,671

 
93,923

Basic earnings per share
 
$
1.78

 
$
2.23

 
$
5.72

 
$
4.99

Diluted earnings per share
 
$
1.71

 
$
2.18

 
$
5.50

 
$
4.87