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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2017
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 months ended September 30 (in thousands, except per share data) follows:
 
 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
 
2017
 
2016
 
2017
 
2016
Net income
 
$
202,823

 
$
129,618

 
$
457,503

 
$
356,961

Denominator for basic earnings per share
 
90,751

 
92,631

 
91,619

 
92,604

Dilutive securities
 
2,250

 
2,676

 
2,304

 
2,600

Denominator for diluted earnings per share
 
93,001


95,307


93,923

 
95,204

Basic earnings per share
 
$
2.23

 
$
1.40

 
$
4.99

 
$
3.85

Diluted earnings per share
 
$
2.18

 
$
1.36

 
$
4.87

 
$
3.75