Annual report pursuant to Section 13 and 15(d)

Equity Offerings (Details Textual)

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Equity Offerings (Details Textual) (USD $)
1 Months Ended 12 Months Ended
Mar. 31, 2011
Mar. 15, 2011
Mar. 14, 2011
Dec. 31, 2012
Dec. 31, 2011
Class of Stock [Line Items]          
Original issuance, shares 27,000,000   27,000,000 27,000,000  
Series D Cumulative Convertible Preferred Stock, par value       $ 0.01  
Common stock shares issued, per share     $ 3.75    
Equity Offerings (Textual) [Abstract]          
Common Stock, par value       $ 0.01 $ 0.01
Additional Common stock granted to underwriters   2,397,029 4,050,000    
Additional Common stock underwriters exercised       2,397,029  
Common stock shares sold   5,333,000      
Series D Preferred Stock [Member]
         
Class of Stock [Line Items]          
Issuance of Series D Preferred Stock       8.00%  
Gamma Trust [Member]
         
Class of Stock [Line Items]          
Original issuance, shares 3,200,000