Lavaca County AMI Acreage

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- Definition

Appalachian asset daily gas production

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- Definition

Number of Wells Drilled

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No definition available.

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- Definition

PercentageOfGasProduction

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- Definition

PercentGasReserves

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- Definition

Working Interest Acquired

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No definition available.

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- Definition

The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value.

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- Definition

Gain (loss) recorded from sale of oil and gas properties, includes the realized gains (losses) on the sale of proved and unproved oil and gas properties.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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-Glossary Investing Activities

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Net quantities of an enterprise's interests in proved developed reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as "barrels" for oil and synthetic oil reserves or "cubic feet" or "cubic meters" for natural gas and synthetic gas reserves.

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The number of wells in the process of being drilled in each geographic area as of the date listed.

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-Publisher SEC

-Name Industry Guide

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Acquisitions and Divestitures - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended		6 Months Ended			1 Months Ended				1 Months Ended	3 Months Ended
	Jun. 30, 2012 ft3	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011 ft3	Dec. 31, 2011 Eagle Ford acre Well	Jun. 30, 2012 Eagle Ford Well	Dec. 31, 2011 Eagle Ford Maximum Well	Dec. 31, 2011 Eagle Ford Partner Well	Jan. 31, 2012 Counties of Butler and Armstrong in Pennsylvania	Jun. 30, 2012 Counties of Butler and Armstrong in Pennsylvania
Business Acquisition [Line Items]
AMI Acreage (in acres)							13,500
Working interest							57.00%
Asset Impairment Charges		$ 28,616,000	$ 71,071,000	$ 28,616,000	$ 71,071,000
Number of wells to be drilled									6	3
Number of wells drilled							4	3.8
Proceeds from the sale of oil and gas property, net				527,000	696,000						1,000,000	100,000,000
June Daily Gas Production (in ft3)	20,000,000
Percentage Of Gas Production	100.00%
Proved Developed Reserves (Volume ft3)						106,000,000,000
Percent Gas Reserves						96.00%
Gain on sale of undeveloped acres											$ 600,000