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Net Income Per Share (Tables)
12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Basic and Diluted Net Income Per Share
The calculation of basic and diluted net income per share is as follows:
 
Year Ended December 31,
 
2017
 
2016
 
2015
 
(In thousands, except per share data)
Net income
$
20,605

 
$
603

 
$
30,760

Weighted-average shares outstanding — basic
37,483

 
36,156

 
35,857

Add: Dilutive effect of employee stock plans
1,229

 
708

 
861

Weighted-average shares outstanding — diluted
38,712

 
36,864

 
36,718

Net income per share — basic
$
0.55

 
$
0.02

 
$
0.86

Net income per share — diluted
$
0.53

 
$
0.02

 
$
0.84

Anti-dilutive weighted-average shares related to stock award plans
501

 
1,345

 
555