Costs Incurred for Property Acquisitions Exploration and Development (Details) (USD $) In Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2011	Dec. 31, 2010
Acquisitions:
Unproved leasehold	$ 0	$ 3,697
Proved properties	542	130,767
Asset retirement obligations	0	556
Acreage purchases	144,652	151,572
Development	762,067	727,720
Exploration:
Drilling	136,181	50,433
Expense	53,270	56,298
Stock-based compensation expense	3,115	4,209
Gas gathering facilities:
Development	37,072	19,627
Subtotal	1,136,899	1,144,879
Asset retirement obligations	13,568	(6,370)
Total costs incurred - continuing operations	1,150,467	1,138,509
Discontinued operations	3,245	73,369
Total costs incurred	$ 1,153,712	$ 1,211,878

Subtotal costs incurred of oil and gas properties.

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Costs incurred acreage purchases.

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Costs incurred Drilling Costs.

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Gas gathering facilities.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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

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

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