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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2012
Accounts Receivable  
Schedule of allowance for bad debt

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

 
   2012
   2011
   2010
  
   

Balance as of beginning of period

   $ 24,301   $ 20,201   $ 19,690  

Charges to provision for bad debt

     4,790     8,173     4,262  

Write-off of uncollectible accounts receivable

     (6,025)     (4,681)     (4,291)  

Recoveries of bad debt

     653     608     540  
   

Balance as of end of period

   $ 23,719   $ 24,301   $ 20,201