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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2018
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,
2018
 
March 31,
2017
Net income
$
84,280

 
$
63,306

Weighted average shares outstanding – basic
83,931

 
85,456

Dilutive effect of stock plans
2,221

 
1,768

Weighted average shares outstanding – diluted
86,152

 
87,224

Basic earnings per share
$
1.00

 
$
0.74

Diluted earnings per share
$
0.98

 
$
0.73

Anti-dilutive shares
—

 
309