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Supplemental Oil and Natural Gas Disclosures (Unaudited) (Standardized Measure) (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Standardized Measure [Abstract]
Future cash inflows	$ 34,779,549	$ 38,165,122	$ 26,698,819
Future production costs	(13,114,740)	(12,570,015)	(9,702,896)
Future development costs	(2,034,174)	(3,026,898)	(1,912,457)
Future income taxes	(6,672,857)	(7,379,972)	(4,700,023)
Future net cash flows	12,957,778	15,188,237	10,383,443
10% annual discount for estimated timing of cash flows	(6,543,398)	(8,180,632)	(5,465,516)
Standardized measure of discounted future net cash flows	$ 6,414,380	$ 7,007,605	$ 4,917,927

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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