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Preferred Stock Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Mar. 12, 2015
Dec. 31, 2011
Sep. 30, 2009
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2011
Class of Stock [Line Items]            
Threshold trading days     20 days     20 days
Conversion threshold consecutive trading days     30 days     30 days
Series 2009 Preferred Stock [Member]            
Class of Stock [Line Items]            
Shares issued     3,710 0 3,610  
Preferred stock, including additional paid in capital     $ 3.7      
Dividend rate 8.00%   8.00% 0.00% 8.00%  
Par value $ 1.00   $ 1.00 $ 0 $ 1.00  
Liquidation preference per share $ 1,000   1,000      
Redemption price per share     $ 5.50      
Threshold percentage of preferred stock redemption price per share     135.00%      
Series 2011 Preferred Stock [Member]            
Class of Stock [Line Items]            
Shares issued   12,000   0 11,914 12,000
Preferred stock, including additional paid in capital   $ 6.0       $ 6.0
Dividend rate 8.00% 8.00%   0.00% 8.00%  
Par value $ 1.00 $ 1.00   $ 0 $ 1.00 $ 1.00
Liquidation preference per share $ 500 500       500
Redemption price per share   $ 4.00       $ 4.00
Threshold percentage of preferred stock redemption price per share           135.00%
Preferred Non-Convertible Stock [Member]            
Class of Stock [Line Items]            
Dividend rate       8.00%