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Net Income (Loss) Per Share (Tables)
 3 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Basic and Diluted Net Income Per Share
The basic and diluted net income (loss) per share calculation for the three months ended March 31, 2018 and 2017 was as follows:
 
Three months ended March 31,
 
2018
 
2017
 
(In thousands, except per share data)
Net income (loss)
$
2,720

 
$
(10,335
)
Weighted-average shares outstanding — basic
38,635

 
36,840

Effect of dilutive securities from stock award plans
1,056

 
—

Weighted-average shares outstanding — diluted
$
39,691

 
$
36,840

Net income (loss) per share - basic
$
0.07

 
$
(0.28
)
Net income (loss) per share - diluted
$
0.07

 
$
(0.28
)
 
 
 
 
Anti-dilutive weighted-average shares related to stock award plans
1,113

 
4,236