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Net Income (Loss) Per Share
 9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Income (Loss) Per Share
Net Income (Loss) Per Share
The following table sets forth the computation of basic and diluted net income (loss) per share, (in thousands, except per share data):
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
2017
 
2016
 
2017
 
2016
Numerator:
 
 
 
 
 
 
 
 
Net income (loss)
 
$
27,830

 
$
(1,569
)
 
$
86,599

 
$
(32,990
)
 
 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
 
Basic weighted average shares outstanding
 
48,181

 
49,075

 
48,130

 
49,016

Add effects of share-based compensation instruments (1)
 
353

 
—

 
209

 
—

Diluted weighted average shares outstanding
 
48,534

 
49,075

 
48,339

 
49,016

Basic income (loss) per share
 
$
0.58

 
$
(0.03
)
 
$
1.80

 
$
(0.67
)
Diluted income (loss) per share
 
$
0.57

 
$
(0.03
)
 
$
1.79

 
$
(0.67
)

(1)
Excluded from the computation of diluted earnings per share for the three and nine months ended September 30, 2017 were 1.6 million stock options and SARs outstanding as of September 30, 2017, because to include them would have been anti-dilutive. Excluded from the computation of diluted earnings per share for the three and nine months ended September 30, 2016 were approximately 2.3 million stock options, SARs and restricted share units outstanding as of September 30, 2016, because to include them would have been anti-dilutive due to the net losses.