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Net Income (Loss) Per Share (Tables)
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Basic and Diluted Loss Per Common Share Computation
Basic and diluted income (loss) per common share is computed as follows (in thousands except share and per share data):
 
Three Months Ended June 30,
Six Months Ended June 30,
 
2017
 
2016
2017
 
2016
Numerator:
 
 
 
 
 
 
Net income (loss) used for calculation of basic and diluted EPS
$
(40,654
)
 
$
40,464

$
(78,310
)
 
$
10,101

 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
Weighted average shares outstanding, basic
35,784,804

 
34,616,197

35,373,799

 
34,560,021

Effect of dilutive securities:
 
 
 
 
 
 
Stock options and restricted stock units
—

 
1,401,214

—

 
1,406,966

Weighted average shares outstanding, diluted
35,784,804

 
36,017,411

35,373,799

 
35,966,987

 
 
 
 
 
 
 
Net income (loss) per share, basic
$
(1.14
)
 
$
1.17

$
(2.21
)
 
$
0.29

Net income (loss) per share, diluted
$
(1.14
)
 
$
1.12

$
(2.21
)
 
$
0.28