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Preferred, Common Stock and Additional Paid in Capital - Equity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 0 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Preferred Stock
Dec. 31, 2012
Preferred Stock
Oct. 07, 2013
Common Stock
Jul. 25, 2013
Common Stock
Jul. 22, 2011
Common Stock
Nov. 23, 2009
Common Stock
Nov. 22, 2009
Common Stock
Preferred Stock:                    
Preferred Stock - Shares Authorized       25,000,000 25,000,000          
Preferred Stock - Par Value       $ 0.01 $ 0.01          
Preferred Stock - Shares Issued       0 0          
Common Stock:                    
Common Stock - Shares Authorized                 300,000,000 100,000,000
Common Stock - Par Value                 $ 0.01 $ 0.01
Common shares offered in public offering           8,050,000 15,338,861 1,113,334    
Public offering price           $ 8.8   $ 27    
Proceeds from issuance of common stock $ 150,905 $ 0 $ 28,786     $ 68,124 $ 77,898      
Offering expenses           $ 2,716 $ 2,167