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Additional Balance Sheet Information (Tables)

9 Months Ended

Sep. 30, 2012

Additional Balance Sheet Information [Abstract]

Components of balance sheet amounts

(Thousands of dollars)		September 30, 2012				December 31, 2011
Accounts Receivable:
Joint interest billing		$	5,845			$	2,347
Trade receivables			1,771				1,558
Oil and gas sales			10,535				9,876
Other			393				3,146
			18,544				16,927
Less: Allowance for doubtful accounts			(386	)			(421	)
Total		$	18,158			$	16,506
Accounts Payable:
Trade		$	4,940			$	5,853
Royalty and other owners			11,168				13,645
Prepaid drilling deposits			698				779
Other			8,801				9,261
Total		$	25,607			$	29,538

(Thousands of dollars)		September 30, 2012				December 31, 2011
Accrued Liabilities:
Compensation and related expenses		$	4,451			$	2,137
Property costs			3,003				5,117
Income tax			—				362
Other			810				1,347
Total		$	8,264			$	8,963

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