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Accounts Receivable
 6 Months Ended
Jun. 30, 2011
Accounts Receivable
4.    Accounts Receivable
 
The following table summarizes our accounts receivable by type as of the periods presented:

   
June 30,
    
December 31,
  
   
2011
    
2010
  
Revenue customers
   $ 51,050     $ 44,783  
Joint interest partners
     16,707       23,526  
Other
     314       4,442  
      68,071       72,751  
Less: Allowance for doubtful accounts
     (292 )     (373 )
    $ 67,779     $ 72,378  
 
For the six months ended June 30, 2011 and 2010, four customers accounted for $84.0 million and $60.4 million, or approximately 60% and 51%, respectively, of our total consolidated product revenues.  As of June 30, 2011 and December 31, 2010, $28.3 million and $31.1 million, or approximately 42% and 43%, 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.