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Additional Balance Sheet Information

6 Months Ended

Jun. 30, 2012

(4) Additional Balance Sheet Information:

Certain balance sheet amounts are comprised of the following:


(Thousands of dollars)	June 30, 2012			December 31, 2011
Accounts Receivable:
Joint interest billing	$	8,744		$	2,347
Trade receivables		1,951			1,558
Oil and gas sales		8,478			9,876
Other		1,294			3,146

		20,467			16,927
Less: Allowance for doubtful accounts		(428	)		(421	)

Total	$	20,039		$	16,506


Accounts Payable:
Trade	$	4,878		$	5,853
Royalty and other owners		10,626			13,645
Prepaid drilling deposits		570			779
Other		15,588			9,261

Total	$	31,662		$	29,538


(Thousands of dollars)	June 30, 2012		December 31, 2011
Accrued Liabilities:
Compensation and related expenses	$	4,050	$	2,137
Property costs		3,282		5,117
Income tax		—		362
Other		1,190		1,347

Total	$	8,522	$	8,963