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Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2011
Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts
      September 30,       September 30,       September 30,       September 30,  
    Balance at
Beginning  of
Year		     Charged to
Expense		     Deductions(1)     Balance at
End of
Year		  

Allowance for doubtful accounts receivable:

                                

Year ended December 31, 2011

   $ 30,112       34,364       (52,770 )    $ 11,706  

Year ended December 31, 2010

   $ 7,553       38,511       (15,952 )    $ 30,112  

Year ended December 31, 2009

   $ 6,356       14,016       (12,819 )    $ 7,553  

 

(1) Deductions represent accounts written off, net of recoveries.