Costs Incurred for Property Acquisitions Exploration and Development (Details) (USD $) In Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2011	Dec. 31, 2010
Acquisitions:
Unproved leasehold		$ 3,697
Proved properties		130,767
Asset retirement obligations		556
Acreage purchases	67,410	151,572
Development	476,702	727,720
Exploration:
Drilling	68,936	50,433
Expense	36,513	56,298
Stock-based compensation expense	2,266	4,209
Gas gathering facilities:
Development	11,540	19,627
Subtotal	663,097	1,144,879
Asset retirement obligations	12,716	(6,370)
Total costs incurred - continuing operations	675,813	1,138,509
Discontinued operations	3,502	73,369
Total costs incurred	$ 679,315	$ 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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Costs Incurred Exploration Of Oil And Gas Properties.

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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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