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Issuances of Additional Beneficial Certificate Units (Details) (USD $)
3 Months Ended 9 Months Ended
Jun. 30, 2012
Sep. 30, 2012
Sep. 30, 2011
May 31, 2012
Class of Stock [Line Items]        
Common Stock shares, issued 12,650,000      
Sale Price of Common Stock per Share       $ 5.06
Proceeds from Issuance of Common Stock   $ 59,948,265 $ 0  
Payments of Stock Issuance Costs $ 4,000,000