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Additional Balance Sheet Information

12 Months Ended

Dec. 31, 2011

Additional Balance Sheet Information [Abstract]

Additional Balance Sheet Information

3. Additional Balance Sheet Information

Accounts receivable at December 31, 2011 and 2010 consisted of the following:

		December 31,
(Thousands of dollars)		2011				2010
Joint interest billings		$	2,347			$	2,538
Trade receivables			1,558				1,688
Oil and gas sales			9,876				8,139
Other			3,146				724
			16,927				13,089
Less: Allowance for doubtful accounts			(421	)			(341	)
Total		$	16,506			$	12,748

Accounts payable at December 31, 2011 and 2010 consisted of the following:

		December 31,
(Thousands of dollars)		2011				2010
Trade		$	5,853			$	3,421
Royalty and other owners			13,645				10,395
Prepaid drilling deposits			779				12,871
Other			9,261				7,689
Total		$	29,538			$	34,376

Accrued liabilities at December 31, 2011 and 2010 consisted of the following:

		December 31,
(Thousands of dollars)		2011				2010
Compensation and related expenses		$	2,137			$	2,010
Property costs			5,117				3,282
Income tax			362				930
Other			1,347				1,454
Total		$	8,963			$	7,676

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