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Net Income (Loss) Per Share (Tables)
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share Reconciliation
A reconciliation of basic and diluted net (loss) income per share, together with the related shares outstanding in thousands is as follows: 
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
Net (Loss) Income Per Share:
 
2018
 
2017
 
2018
 
2017
 
 
 
 
 
 
 
 
 
Net (loss) income
 
$
(15,771
)
 
$
21,679

 
$
(31,445
)
 
$
76,516

 
 
 
 
 
 
 
 
 
Weighted average shares:
 
 

 
 

 
 
 
 
Basic shares
 
36,904

 
40,061

 
37,410

 
40,839

Effect of dilutive securities—options, RSU’s, ESPP shares and warrants outstanding
 
—

 
1,278

 
—

 
1,355

Diluted shares
 
36,904

 
41,339

 
37,410

 
42,194

 
 
 
 
 
 
 
 
 
Net (loss) income per share - basic
 
$
(0.43
)

$
0.54

 
$
(0.84
)
 
$
1.87

Net (loss) income per share - diluted  
 
$
(0.43
)

$
0.52

 
$
(0.84
)
 
$
1.81