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Valuation and Qualifying Accounts
 3 Months Ended
Mar. 31, 2012
Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts

4. Allowance for Doubtful Accounts

 

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

Three months ended March 31, 2012

   $ 11,706       4,122       (6,984 )    $ 8,844  

Three months ended March 31, 2011

   $ 30,112       10,034       (8,780 )    $ 31,366  

 

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