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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 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 years ended December 31 (in thousands, except per share data) follows:
 
 
 
2016
 
2015
 
2014
Net income
 
$
452,385

 
$
362,431

 
$
368,707

Denominator for basic earnings per share
 
92,597

 
92,023

 
84,317

Dilutive securities
 
2,616

 
2,116

 
2,665

Denominator for diluted earnings per share
 
95,213


94,139


86,982

Basic earnings per share
 
$
4.89

 
$
3.94

 
$
4.37

Diluted earnings per share
 
4.75

 
3.85

 
4.24