Annual report pursuant to section 13 and 15(d)

Shareholders' Equity (Capital Stock) (Details)

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Shareholders' Equity (Capital Stock) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 2 Months Ended
May 31, 2013
Dec. 31, 2011
Dec. 31, 2013
Jun. 24, 2013
May 09, 2013
Mar. 31, 2013
Dec. 31, 2012
May 31, 2013
Employee brokerage commission expenses
May 31, 2013
Series A Preferred Stock
May 24, 2013
Series A Preferred Stock
Dec. 31, 2013
Series A Preferred Stock
Jun. 24, 2013
Series A Preferred Stock
May 21, 2013
Series A Preferred Stock
Mar. 07, 2014
Series A Preferred Stock
Subsequent event
Class of Stock [Line Items]                            
Preferred stock, shares authorized     25,000,000   25,000,000 2,000,000 2,000,000       8,290,000      
Common stock, shares authorized     600,000,000   600,000,000 400,000,000 400,000,000              
Preferred stock, shares outstanding                     6,189,497 3,000,000 5,290,000  
Preferred stock, par value     $ 0.0001       $ 0.0001       $ 0.0001   $ 0.0001  
Preferred stock, dividend rate                   8.00% 8.00%      
Preferred stock, liquidation preference                   $ 25.00   $ 25.00    
Preferred stock, liquidation preference per month                   $ 2.00        
Preferred stock, shares issued                     6,189,497      
Preferred stock issued during period                   4,600,000        
Additional paid in capital   $ 60               $ 115,000        
Additional new shares issues                 690,000          
Additional proceeds from public offering                 17,250          
Proceeds from Issuance of public offering                 132,250   22,062     10,601
Offering expenses 5,972             2,603     411      
At the market preferred stock, shares authorized       3,000,000                    
At the market shares sold                     899,497     469,716
Dividends paid                     $ 6,911      
Dividends paid per share on monthly basis                     $ 0.17