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Supplemental Information (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Standardized measure of discounted future net cash flows and changes therein relating to proved oil and gas reserves
Sales of oil and gas produced, net of production costs	$ (48,673)	$ (59,133)
Net changes in prices and production costs	504	77,637
Extensions, discoveries and improved recovery	164,557	49,108
Revisions of previous quantity estimates	40,964	8,579
Net change in development costs	(145,382)	(30,834)
Reserves sold
Reserves purchased	6,563
Accretion of discount	18,451	14,648
Net change in income taxes	(5,952)	(20,342)
Changes in production rates (timing) and other	(2,267)	(1,639)
Net change	28,765	38,024
Standardized measure of discounted future net cash flow:
Beginning of year	184,508	146,484
End of year	$ 213,273	$ 184,508

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The increase in the net discounted value of the proved oil and gas reserves due only to the passage of time.

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The increase (decrease) in the evaluation or calculation of the costs that will be required in future periods to make it possible to extract or process proved oil and gas reserves.

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The increase (decrease) in sales and transfer prices and in production (lifting) costs related to future production. The effects of changes in prices and costs are computed before the effects of changes in quantities.

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Any changes made during the period to the evaluation or calculation of the estimated quantity of oil or gas in proved reserves.

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Changes in the standardized measure of discounted future net cash flows relating to proved oil and gas reserves that are not otherwise specified in the taxonomy.

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The balance as of the balance sheet date of the standardized measure of discounted future net cash flow relating to proved oil and gas reserves.

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