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Net Income (Loss) Per Share (Tables)
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Schedule of Basic and Diluted Net Income (Loss) Per Share
The following table presents the computations of basic and diluted net income (loss) per share (in thousands, except per share amounts):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
Net income (loss)
$
(67,446
)
 
$
50,021

 
$
(102,888
)
 
$
(66,329
)
 
 
 
 
 
 
 
 
Weighted average common shares outstanding - basic
159,304

 
143,357

 
156,799

 
142,876

Dilutive potential common shares
—

 
4,711

 
—

 
—

Weighted average common shares outstanding - diluted
159,304

 
148,068

 
156,799

 
142,876

 
 
 
 
 
 
 
 
Net income (loss) per share - basic
$
(0.42
)
 
$
0.35

 
$
(0.66
)
 
$
(0.46
)
Net income (loss) per share - diluted
$
(0.42
)
 
$
0.34

 
$
(0.66
)
 
$
(0.46
)