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Earnings per Share (Tables)
 6 Months Ended
Jun. 30, 2013
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 June 30,
 
Six Months Ended June 30,
 
2013
 
2012
 
2013
 
2012
Net loss
$
(25,438
)
 
(5,638
)
 
$
(41,821
)
 
$
(17,537
)
Less: Preferred stock dividends
(1,725
)
 
—

 
(3,450
)
 
—

Loss attributable to common shareholders - Basic and Diluted
$
(27,163
)
 
$
(5,638
)
 
$
(45,271
)
 
$
(17,537
)
 
 
 
 
 
 
 
 
Weighted-average shares - Basic
62,899

 
46,030

 
59,141

 
45,988

Effect of dilutive securities 1
—

 
—

 
—

 
—

Weighted-average shares - Diluted
62,899

 
46,030

 
59,141

 
45,988

_______________________
1 For the three and six months ended June 30, 2013, approximately 19.2 million and less than 0.1 million potentially dilutive securities, including the 6% 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.