Earnings Per Common Share (Details)	6 Months Ended
	Jun. 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