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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2016
Earnings Per Share [Abstract]  
Details of Basic and Diluted EPS
The details of basic and diluted EPS are as follows:
 
Three Months Ended
(in thousands, except per share data)
March 31,
2016
 
March 31,
2015
Net income
$
56,468

 
$
56,132

Weighted average shares outstanding – basic
88,114

 
90,059

Dilutive effect of stock plans
1,970

 
2,081

Weighted average shares outstanding – diluted
90,084

 
92,140

Basic earnings per share
$
0.64

 
$
0.62

Diluted earnings per share
$
0.63

 
$
0.61

Anti-dilutive shares
287

 
237