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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2013
Accounts Receivable  
Schedule of allowance for bad debt

The following table sets forth activities in our allowance for bad debt (in thousands):

 
   2013
   2012
   2011
  
   

Balance as of beginning of period

   $ 23,719   $ 24,301   $ 20,201  

Charges to provision for bad debt

     11,745     4,790     8,173  

Write-off of uncollectible accounts receivable

     (6,940)     (6,025)     (4,681)  

Recoveries of bad debt

     664     653     608  
   

Balance as of end of period

   $ 29,188   $ 23,719   $ 24,301