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Disclosure About Oil and Gas Producing Activities (Unaudited) (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Oil And Gas Exploration And Production Industries [Abstract]
Acquisition costs - unproved properties	$ 91,983	$ 472,339	$ 33,176
Exploration	48,998	249,029	102,217
Development	1,372,805	855,110	605,958
Total	$ 1,513,786	$ 1,576,478	$ 741,351

- Definition

Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have unproved reserves.

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- Definition

Development costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities.

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- Definition

Exploration costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities.

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