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Earnings Per Share (Tables)
 3 Months Ended
Mar. 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 three month period ended March 31 follows (in thousands, except per share data):
 
 
 
Three Months Ended
March 31,
 
 
2018
 
2017
Net income
 
$
174,937

 
$
123,693

Denominator for basic earnings per share
 
89,765

 
92,108

Dilutive securities
 
3,485

 
2,452

Denominator for diluted earnings per share
 
93,250


94,560

Basic earnings per share
 
$
1.95

 
$
1.34

Diluted earnings per share
 
$
1.88

 
$
1.31