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Common Stock and Loss Per Share (Tables)
 6 Months Ended
Jun. 30, 2017
Stockholders' Equity Note [Abstract]  
Reconciliation of Numerators and Denominators of Basic and Diluted Earnings (Loss) Per Share Computations
The following is a reconciliation of the numerators and denominators of the basic and diluted loss per share computations shown on the consolidated statements of comprehensive loss (in thousands, except per share data):
 
 
For the Three Months 
 Ended June 30,
 
For the Six Months 
 Ended June 30,
 
 
2017
 
2016
 
2017
 
2016
Basic and diluted loss per share
 
 
 
 
 
 
 
 
Net loss available to common stockholders (numerator)
 
$
(94,309
)
 
$
(489,963
)
 
$
(89,801
)
 
$
(662,665
)
Weighted-average common shares outstanding (denominator)
 
36,536

 
35,811

 
36,475

 
35,679

Basic and diluted loss per common and common equivalent share
 
$
(2.58
)
 
$
(13.68
)
 
$
(2.46
)
 
$
(18.57
)
Schedule of Antidilutive Securities Excluded from Computation of Dilutive Earnings (Loss) Per Share
The following table summarizes antidilutive securities that would be excluded from the computation of dilutive earnings per share (in thousands):
 
 
For the Three Months 
 Ended June 30,
 
For the Six Months 
 Ended June 30,
 
 
2017
 
2016
 
2017
 
2016
Outstanding share-based compensation awards
 
 
 
 
 
 
 
 
Stock options (1)
 
3,567

 
3,018

 
3,567

 
2,942

Performance shares (2)
 
—

 
—

 
—

 
—

Restricted stock units
 
337

 
461

 
170

 
461

Assumed conversion of Convertible Notes
 
4,932

 
4,932

 
4,932

 
4,932

__________
(1)
Includes out-of-the-money stock options totaling 3.6 million and 3.1 million at June 30, 2017 and 2016, respectively.
(2)
Performance shares represent the number of shares expected to be issued based on the performance percentage as of the end of the reporting periods above.