XML 67 R13.htm IDEA: XBRL DOCUMENT v2.4.0.6
Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2011
Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts

4. 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.