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Supplemental Information (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Capitalized costs related to oil and gas producing activities
Proved Developed oil and gas properties	$ 336,135	$ 491,938
Proved Undeveloped oil and gas properties	2,069	455
Unproved oil and gas properties
Total Capitalized Costs	338,204	492,393
Accumulated depreciation, depletion and valuation allowance	150,276	355,643
Net Capitalized Costs	$ 187,928	$ 136,750

X

- Definition

Amount of accumulated depreciation, depletion, amortization and valuation allowance relating to oil and gas producing activities.

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The sum of capitalized costs relating to oil and gas producing activities before accounting for accumulated depreciation.

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Net amount of capitalized costs relating to oil and gas producing activities.

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Capitalized costs of proved properties incurred for any combination mineral interests acquisitions; wells and related equipment; support equipment and facilities; and uncompleted wells and equipment and other costs not previously disclosed within this table.

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