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Supplemental Gas Data Oil and Gas Expenditures (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Proven properties	$ 6,673	$ 1,476,470	$ 30,405
Unproven properties	58,731	1,922,334	50,705
Development	463,401	472,691	181,944
Exploration	$ 131,419	$ 58,655	$ 46,023

- Definition

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

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- 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.

+ References+ Details