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Earnings Per Share (Tables)
 6 Months Ended
Jun. 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 six months ended June 30 (in thousands, except per share data) follows:
 
 
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
 
2016
 
2015
 
2016
 
2015
Net income
 
$
114,185

 
$
98,678

 
$
224,157

 
$
192,831

Denominator for basic earnings per share
 
92,665

 
91,904

 
92,591

 
91,828

Dilutive securities
 
1,884

 
2,146

 
1,846

 
2,164

Denominator for diluted earnings per share
 
94,549


94,050


94,437

 
93,992

Basic earnings per share
 
$
1.23

 
$
1.07

 
$
2.42

 
$
2.10

Diluted earnings per share
 
$
1.21

 
$
1.05

 
$
2.37

 
$
2.05