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Capital (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 0 Months Ended
Apr. 18, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 24, 2012
May 01, 2013
Subsequent Event [Member]
Apr. 18, 2013
Subsequent Event [Member]
Dividend Declared [Member]
Dividends Payable [Line Items]            
Common stock authorized   500,000,000 500,000,000      
Common stock par value   $ 0.01 $ 0.01      
Preferred stock authorized   100,000,000 100,000,000      
Preferred stock par value   $ 0.01 $ 0.01      
Common stock outstanding   1,633,378 1,633,378      
Preferred shares issued   0 0      
Common Stock, Value, Subscriptions       $ 31.5    
Capital commitments   21.0 21.0      
Remaining Capital Commitment         $ 0  
Stock dividend declared percent           3.7066%
Stock dividend (in shares) 58,378          
Dividend per share (in dollars per share)           $ 20.38