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Earnings per Share (Tables)
 3 Months Ended
Mar. 31, 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 March 31,
 
2013
 
2012
Net loss
(16,383
)
 
(11,899
)
Less: Preferred stock dividends
(1,725
)
 
—

Loss attributable to common shareholders - Basic and Diluted
$
(18,108
)
 
$
(11,899
)
 
 
 
 
Weighted-average shares - Basic
55,341

 
45,945

Effect of dilutive securities 1
—

 
—

Weighted-average shares - Diluted
55,341

 
45,945

_______________________
1 For the three months ended March 31, 2013 and 2012, respectively, 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.