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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2016
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,
 
 
2016
 
2015
 
2016
 
2015
Net income
 
$
129,618

 
$
116,770

 
$
356,961

 
$
309,601

Denominator for basic earnings per share
 
92,631

 
92,110

 
92,604

 
91,923

Dilutive securities
 
2,676

 
2,047

 
2,600

 
2,146

Denominator for diluted earnings per share
 
95,307


94,157


95,204

 
94,069

Basic earnings per share
 
$
1.40

 
$
1.27

 
$
3.85

 
$
3.37

Diluted earnings per share
 
$
1.36

 
$
1.24

 
$
3.75

 
$
3.29