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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2014
Accounts Receivable  
Schedule of allowance for bad debt

 

 

 

 

 

 

 

 

 

 

 

    
2014 

    
2013 

    
2012 

Balance as of beginning of period

 

$
29,188 

 

$
23,719 

 

$
24,301 

Charges to provision for bad debt

 

 
3,757 

 

 
11,745 

 

 
4,790 

Write-off of uncollectible accounts receivable

 

 
(8,074)

 

 
(6,940)

 

 
(6,025)

Recoveries of bad debt

 

 
821 

 

 
664 

 

 
653 

Balance as of end of period

 

$
25,692 

 

$
29,188 

 

$
23,719