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Stockholders' Equity (Details) (USD $)
Dec. 31, 2013
Year from November 1, 2012 to October 31, 2013
 
Stockholders' equity  
Redemption price per share (in dollars per share) $ 10.12
Year from November 1, 2013 to October 31, 2014
 
Stockholders' equity  
Redemption price per share (in dollars per share) $ 10.06
November 1, 2014 and thereafter
 
Stockholders' equity  
Redemption price per share (in dollars per share) $ 10