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Series B Redeemable Preferred Stock (Details) (Redeemable Preferred Stock Series B [Member], USD $)
9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Redeemable Preferred Stock Series B [Member]
   
Class of Stock [Line Items]    
Preferred stock, shares outstanding 332,500 332,500
Annual dividend rate 10.00% 10.00%
Preferred stock, shares sold date June 3, 2008  
Preferred stock, sales price per share $ 25.00  
Preferred stock, fixed annual amount of dividend per share $ 2.50  
Preferred stock, liquidation preference per share $ 25.00  
Preferred stock, redemption price $ 25.00