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Earnings per Share (Tables)
 6 Months Ended
Jun. 30, 2015
Earnings Per Share [Abstract]  
Components of Calculation of Basic and Diluted Earnings Per Share
The following table provides a reconciliation of the components used in the calculation of basic and diluted earnings per share for the periods presented:
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2015
 
2014
 
2015
 
2014
Net loss
$
(80,129
)
 
$
(100,784
)
 
$
(137,294
)
 
$
(81,559
)
Less: Preferred stock dividends 1
(6,067
)
 
(1,718
)
 
(12,134
)
 
(3,440
)
Less: Induced conversion of preferred stock
—

 
(3,368
)
 
—

 
(3,368
)
Net loss attributable to common shareholders – basic and diluted
$
(86,196
)
 
$
(105,870
)
 
$
(149,428
)
 
$
(88,367
)
 
 
 
 
 
 
 
 
Weighted-average shares – basic
72,398

 
66,514

 
72,330

 
66,065

Effect of dilutive securities 2
—

 
—

 
—

 
—

Weighted-average shares – diluted
72,398

 
66,514

 
72,330

 
66,065

_______________________
1 Preferred stock dividends were excluded from the computation of diluted earnings per share as the assumed conversion of the outstanding preferred stock would have been anti-dilutive.
2 For the three and six months ended June 30, 2015, approximately 31.3 million and 31.5 million, respectively, of potentially dilutive securities, including the Series A Preferred Stock and Series B Preferred Stock, stock options and restricted stock units, had the effect of being anti-dilutive and were excluded from the calculation of diluted earnings per common share. For the three and six months ended June 30, 2014, approximately 18.8 million and 17.2 million, respectively, of potentially dilutive securities, including the Series A Preferred Stock and Series B Preferred Stock, stock options and restricted stock units, had the effect of being anti-dilutive and were excluded from the calculation of diluted earnings per common share.