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Financial Statements Schedule I (Details 3) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Balance Sheets    
Accounts receivable trade, allowance $ 47,582,216 $ 9,505,481
Common share, par value (in dollars per share) $ 0 $ 0
Common shares, shares issued 43,242,426 43,155,767
Common shares, shares outstanding 43,242,426 43,155,767
Parent Company
    
Balance Sheets    
Accounts receivable trade, allowance $ 8,946,661 $ 871,385
Common share, par value (in dollars per share) $ 0 $ 0
Common shares, shares issued 43,242,426 43,155,767
Common shares, shares outstanding 43,242,426 43,155,767