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Net Income (Loss) Per Share (Tables)
 6 Months Ended
Jun. 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 June 30,
 
Six Months Ended June 30,
Net (Loss) Income Per Share:
 
2018
 
2017
 
2018
 
2017
 
 
 
 
 
 
 
 
 
Net (loss) income
 
$
(3,438
)
 
$
28,927

 
$
(15,674
)
 
$
54,837

 
 
 
 
 
 
 
 
 
Weighted average shares:
 
 

 
 

 
 
 
 
Basic shares
 
36,772

 
41,091

 
37,666

 
41,233

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

 
1,396

 
—

 
1,392

Diluted shares
 
36,772

 
42,487

 
37,666

 
42,625

 
 
 
 
 
 
 
 
 
Net (loss) income per share - basic
 
$
(0.09
)

$
0.70

 
$
(0.42
)
 
$
1.33

Net (loss) income per share - diluted  
 
$
(0.09
)

$
0.68

 
$
(0.42
)
 
$
1.29