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Net Income (Loss) Per Share (Tables)
 9 Months Ended
Sep. 30, 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 and nine months ended September 30, 2018 and 2017 was as follows:
 
Three months ended September 30,
 
Nine months ended September 30,
 
2018
 
2017
 
2018
 
2017
 
(In thousands, except per share data)
Net income (loss)
$
13,628

 
$
7,748

 
$
22,936

 
$
(707
)
Weighted-average shares outstanding — basic
39,432

 
37,698

 
39,015

 
37,266

Effect of dilutive securities from stock award plans
1,428

 
1,275

 
1,222

 
—

Weighted-average shares outstanding — diluted
$
40,860

 
$
38,973

 
40,237

 
37,266

Net income (loss) per share - basic
$
0.35

 
$
0.21

 
$
0.59

 
$
(0.02
)
Net income (loss) per share - diluted
$
0.33

 
$
0.20

 
$
0.57

 
$
(0.02
)
 
 
 
 
 
 
 
 
Anti-dilutive weighted-average shares related to stock award plans
673

 
1,383

 
1,176

 
3,757