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Accounts Receivable
9 Months Ended
Sep. 30, 2011
Accounts Receivable
4.    Accounts Receivable
 
The following table summarizes our accounts receivable by type as of the periods presented:
 
   
September 30,
   
December 31,
 
  
 
2011
   
2010
 
Revenue customers
  $ 53,917     $ 44,783  
Joint interest partners
    20,344       23,526  
Other
    1,756       4,442  
  
    76,017       72,751  
Less: Allowance for doubtful accounts
    (281 )     (373 )
  
  $ 75,736     $ 72,378  
 
For the nine months ended September 30, 2011 and 2010, five customers accounted for $135.9 million and $123.0 million, or approximately 61% and 66%, respectively, of our total consolidated product revenues.  As of September 30, 2011 and December 31, 2010, $24.8 million and $32.9 million, or approximately 33% and 45%, respectively, of our consolidated accounts receivable, including joint interest billings, related to these customers. No significant uncertainties exist related to the collectability of amounts owed to us by these customers.