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Valuation and Qualifying Accounts
9 Months Ended
Sep. 30, 2012
Valuation and Qualifying Accounts

4. Valuation and Qualifying Accounts

 

     Balance at
Beginning  of
Period
     Charged to
Expense
     Deductions(1)     Balance at
End of
Period
 

Allowance for doubtful accounts receivable:

          

Nine months ended September 30, 2012

   $ 11,706         13,492         (15,896   $ 9,302   

Nine months ended September 30, 2011

   $ 30,112         27,903         (43,597   $ 14,418   

 

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