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Allowance for Doubtful Accounts (Tables)
3 Months Ended
Mar. 31, 2014
Receivables [Abstract]  
Schedule of Allowance for Doubtful Accounts
     Balance at
Beginning of
Period
     Charged to
Expense
     Deductions(1)     Balance at
End of
Period
 

Three months ended March 31, 2014

   $ 9,678         3,795         (4,973   $ 8,500   

Three months ended March 31, 2013

   $ 8,657         4,941         (5,209   $ 8,389   

 

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