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Allowance for Doubtful Accounts
 9 Months Ended
Sep. 30, 2013
Receivables [Abstract]  
Allowance for Doubtful Accounts

5. Allowance for Doubtful Accounts

 

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

Nine months ended September 30, 2013

    $ 8,657         14,881         (14,073 )    $ 9,465   

Nine months ended September 30, 2012

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

 

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