Accounts Receivable and Major Customers

12 Months Ended

Dec. 31, 2011

Accounts Receivable and Major Customers

4.        Accounts Receivable and Major Customers

The following table summarizes our accounts receivable by type as of the dates presented:

	As of December 31,
	2011			2010
Customers	$	49,763		$	44,783
Joint interest partners		22,755			23,526
Other		1,695			4,442
		74,213			72,751
Less: Allowance for doubtful accounts		(1,781	)		(373	)
	$	72,432		$	72,378

For the years ended December 31, 2011 and 2010, five customers accounted for $173.1 million and $140.2 million, or approximately 58% and 56%, respectively, of our total consolidated product revenues. As of December 31, 2011 and 2010, $31.6 million and $31.1 million, or approximately 44% 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.