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Net Income (Loss) Per Share (Tables)
 6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
Basic and Diluted Net Income Per Share
The calculation of basic and diluted net (loss) income per share is as follows:
 
Three months ended June 30,
 
Six months ended June 30,
 
2016
 
2015
 
2016
 
2015
 
(In thousands, except per share data)
Net (loss) income
$
(1,159
)
 
$
8,751

 
$
(1,537
)
 
$
15,069

Weighted-average shares outstanding — basic
35,987

 
36,120

 
35,864

 
36,072

Effect of dilutive securities from stock award plans
—

 
910

 
—

 
915

Weighted-average shares outstanding — diluted
$
35,987

 
$
37,030

 
35,864

 
36,987

Net (loss) income per share — basic
$
(0.03
)
 
$
0.24

 
$
(0.04
)
 
$
0.42

Net (loss) income per share — diluted
$
(0.03
)
 
$
0.24

 
$
(0.04
)
 
$
0.41

Anti-dilutive weighted-average shares related to stock award plans
1,961

 
377

 
2,037

 
356