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Supplemental Information (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Costs incurred in oil and gas property acquisition exploration and development activities
Acquisition of Properties, Developed	$ 6,482	$ 273
Acquisition of Properties, Undeveloped	2,030	146
Exploration Costs	10	38
Development Costs	$ 66,671	$ 38,820

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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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