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Oil And Natural Gas Properties (Narrative) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Cost for unproved properties	$ 623,268		$ 667,342
Full cost ceiling limitation discount rate	10.00%
Reference prices Per Bbl of oil	$ 98.15
Reference prices per mmbtu of natural gas	$ 3.73
Impairment of Oil and Gas Properties	$ 275,864	$ 0
Minimum [Member]
Evaluation period for oil and natural gas cost	1
Maximum [Member]
Evaluation period for oil and natural gas cost	7

Capitalized costs of unproved properties incurred for any combination mineral interests acquisitions and other costs not previously disclosed within this table.

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- Definition

The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced.

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