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Property And Equipment (Schedule Of Property And Equipment) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Abstract]
Oil and natural gas properties, full-cost accounting	$ 2,906,976	$ 2,477,178
Office furniture and fixtures	6,936	6,093
Building	4,876	4,626
Land	412	412
Total property and equipment	2,919,200	2,488,309
Accumulated depletion, depreciation, amortization and impairment	(841,561)	(784,717)
Property and equipment, net	$ 2,077,639	$ 1,703,592

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing.

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Amount before accumulated depreciation of equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities. Examples include, but are not limited to, desks, chairs, tables, and bookcases.

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Oil and gas properties, gross, carried under the full cost method.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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