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Valuation and Qualifying Accounts
 6 Months Ended
Jun. 30, 2012
Valuation and Qualifying Accounts [Abstract]  
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:

                                

Six months ended June 30, 2012

   $ 11,706       7,871       (11,551 )    $ 8,026  

Six months ended June 30, 2011

   $ 30,112       18,277       (11,444 )    $ 36,945  

 

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