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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, 2012	Dec. 31, 2011	Dec. 31, 2010
Oil And Gas Exploration And Production Industries Disclosures [Abstract]
Acquisition costs - unproved properties	$ 47,979	$ 91,983	$ 472,339
Exploration	199,569	746,085	634,503
Development	587,618	675,718	469,636
Total	$ 835,166	$ 1,513,786	$ 1,576,478

- 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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