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Accounts Receivable
 12 Months Ended
Dec. 31, 2014
Accounts Receivable  
Accounts Receivable
Note 2: Accounts Receivable
Accounts receivable, net consists of the following:
 
December 31,
  
2014
    
2013
  
(in thousands)
        
Trade receivables:
        
Billed
  
$
521,693
    
$
368,583
  
Unbilled
    
125,363
      
80,806
  
Other receivables
    
3,025
      
1,240
  
Total
    
650,081
      
450,629
  
Less: allowance for doubtful accounts
    
(15,351
)
    
(13,497
)
Accounts receivable, net
  
$
634,730
    
$
437,132
  
Trade receivables relate to sale of our services and products, for which credit is extended based on our evaluation of the customer’s credit worthiness.  Unbilled receivables represent revenues earned but not billed to the customer until future dates, usually within one month.  Other receivables consist primarily of amounts due from purchasers of Company property and rebates from suppliers.
Changes in the Company’s allowance for doubtful accounts are as follows:
 
Years Ended December 31,
  
2014
    
2013
  
(in thousands)
        
Beginning balance
  
$
13,497
    
$
9,110
  
Bad debt expense
    
2,280
      
8,815
  
Accounts written-off
    
(1,225
)
    
(5,421
)
Recoveries
    
799
      
993
  
Ending balance
  
$
15,351
 
  
$
13,497