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Exploratory Well Costs (Narrative) (Details) (USD $)	12 Months Ended			3 Months Ended
Exploratory Well Costs (Narrative) (Details) (USD $)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2010 Cosmopolitan Unit [Member]
Exploration and abandonment charge	$ 121,320,000	$ 189,597,000	$ 79,095,000	$ 97,700,000
Suspended well costs				76,000,000
Acreage cost				14,300,000
Estimated property abandonment expense				6,400,000
Inventory impairment				$ 1,000,000

The adjustment to expense previously capitalized costs of drilling exploratory wells when proved reserves are not found or when the entity obtains information that raises substantial doubt about the economic or operational viability of the project.

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- Definition

Charge to cost of goods sold that represents the reduction of the carrying amount of inventory, generally attributable to obsolescence or market conditions.

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