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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 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 months ended March 31 (in thousands, except per share data) follows:
 
 
 
Three Months Ended
March 31,
 
 
 
2017
 
2016
 
Net income
 
$
123,693

 
$
111,090

 
Denominator for basic earnings per share
 
92,108

 
92,516

 
Dilutive securities
 
2,452

 
2,514

 
Denominator for diluted earnings per share
 
94,560


95,030


Basic earnings per share
 
$
1.34

 
$
1.20

 
Diluted earnings per share
 
$
1.31

 
$
1.17