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Allowance for Doubtful Accounts (Tables)
9 Months Ended
Sep. 30, 2014
Receivables [Abstract]  
Schedule of Allowance for Doubtful Accounts
     Balance at
Beginning of
Period
     Charged to
Expense
     Deductions(1)     Balance at
End of
Period
 

Nine months ended September 30, 2014

   $ 9,678         10,835         (13,036   $ 7,477   

Nine months ended September 30, 2013

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

 

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