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Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2012
Schedule of Valuation and Qualifying Accounts
     Balance at
Beginning of
Year		      Charged to
Expense		      Deductions(1)     Balance at
End of
Year		  

Allowance for doubtful accounts receivable:

           

Year ended December 31, 2012

    $ 11,706         18,012         (21,061 )    $ 8,657   

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   

 

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