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Earnings Per Common Share (Details)
9 Months Ended
Sep. 30, 2013
Series D Convertible Preferred Stock
 
Number of cumulative convertible preferred shares to be converted to common shares 15,180,000
Preferred shares, dividend yield (as a percent) 6.50%
Percentage of average closing market price of the entity's common stock based on which ratio for conversion of preferred shares into common shares is determined 98.00%
Common Stock
 
Common shares from conversion of preferred shares 7,298,165