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Earnings Per Share (Tables)
 6 Months Ended
Jun. 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 six months ended June 30 (in thousands, except per share data) follows:
 
 
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
 
2017
 
2016
 
2017
 
2016
Net income
 
$
130,987

 
$
116,253

 
$
254,680

 
$
227,343

Denominator for basic earnings per share
 
92,013

 
92,665

 
92,060

 
92,591

Dilutive securities
 
2,210

 
2,614

 
2,332

 
2,546

Denominator for diluted earnings per share
 
94,223


95,279


94,392

 
95,137

Basic earnings per share
 
$
1.42

 
$
1.25

 
$
2.77

 
$
2.46

Diluted earnings per share
 
$
1.39

 
$
1.22

 
$
2.70

 
$
2.39