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Supplemental Oil and Natural Gas Disclosures (Unaudited) (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Standardized measure of discounted future net cash flows relating to proved oil and natural gas reserves
Future cash inflows	$ 1,273,882	$ 924,796	$ 470,386
Future production costs	(325,413)	(194,538)	(107,183)
Future development costs	(244,283)	(235,469)	(107,277)
Future income tax expense	(77,821)	(83,840)	(35,352)
Future net cash flows	626,365	410,949	220,574
10% annual discount for estimated timing of cash flows	(231,729)	(195,476)	(109,497)
Standardized measure of discounted future net cash flows	$ 394,636	$ 215,473	$ 111,077	$ 65,061

This is the amount that is derived from using a discount rate of ten percent a year to reflect the timing of the future net cash flows relating to proved oil and gas reserves.

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- Definition

The estimated future income tax expenses that will be incurred based on the future income less future expenses derived from production and sale of proved oil and gas reserves in this geographic region.

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- Definition

These amounts are the result of subtracting future development and production costs and future income tax expenses from future cash inflows for each geographic region where proved oil and gas reserves exist.

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