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Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Components of Property and Equipment
Proved oil and gas properties, at cost	$ 345,936	$ 338,204
Less: Accumulated depletion and depreciation	(154,452)	(150,276)
Oil and Gas Properties, Net	191,484	187,928
Field and office equipment	25,151	23,974
Less: Accumulated depreciation	(15,550)	(15,052)
Field and Office Equipment, Net	9,601	8,922
Total Property and Equipment, Net	$ 201,085	$ 196,850

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The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Accumulated depreciation, depletion and amortization of oil and gas property carried under the successful effort method.

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Oil and gas properties net of accumulated depreciation, depletion, amortization, impairment, and abandonment, carried under the successful effort method.

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Amount, net of accumulated depreciation, depletion and amortization, of long-lived 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, furniture and fixtures, and computer equipment.

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Oil and Gas properties with proved reserves under the successful effort method.

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