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