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Earnings Per Share (Tables)
 3 Months Ended
Mar. 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 three months ended March 31 (in thousands, except per share data) follows:
 
 
 
Three Months Ended
March 31,
 
 
 
2016
 
2015
 
Net income
 
$
109,972

 
$
94,153

 
Denominator for basic earnings per share
 
92,516

 
91,750

 
Dilutive securities
 
1,813

 
2,184

 
Denominator for diluted earnings per share
 
94,329


93,934


Basic earnings per share
 
$
1.19

 
$
1.03

 
Diluted earnings per share
 
$
1.17

 
$
1.00