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Additional Balance Sheet Information (Tables)

12 Months Ended

Dec. 31, 2012

Additional Balance Sheet Information [Abstract]

Components of balance sheet amounts

		December 31,
(Thousands of dollars)		2012				2011
Joint interest billings		$	2,189			$	2,347
Trade receivables			1,580				1,558
Oil and gas sales			9,362				9,876
Other			436				3,146
			13,567				16,927
Less: Allowance for doubtful accounts			(355	)			(421	)
Total		$	13,212			$	16,506

		December 31,
(Thousands of dollars)		2012				2011
Trade		$	3,968			$	5,853
Royalty and other owners			9,652				13,645
Prepaid drilling deposits			306				779
Other			5,642				9,261
Total		$	19,568			$	29,538

		December 31,
(Thousands of dollars)		2012				2011
Compensation and related expenses		$	2,517			$	2,137
Property costs			4,549				5,117
Income tax			—				362
Other			552				1,347
Total		$	7,618			$	8,963

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