The cash outflow to purchase of mineral interests in oil and gas properties for use in the normal oil and gas operations and not intended for resale.

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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 do not include reserves relating to interests of others in properties owned by the enterprise. Measured in barrel of oil equivalent (BOE).

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- Definition

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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Acquisitions (Narrative) (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended		3 Months Ended
	Jun. 30, 2010	Jun. 02, 2010 Boe A	Jun. 30, 2010 Southwest Oklahoma And North Texas [Member]	Jun. 02, 2010 Oil Reserves [Member] bbl	Jun. 02, 2010 Natural Gas Liquids Reserves [Member]	Jun. 02, 2010 Natural Gas Reserves [Member] MMcf
Payments to acquire oil and gas property	$ 73.7		$ 17.6
Purchase price allocation for proved properties	48.7
Undeveloped leasehold	$ 25.0
Gas and oil acreage, developed and undeveloped, net		45,000
Number of wells		10
Proved developed reserves (BOE)		762,000
Proved Developed Reserves (Volume)				511,000		573
Proved Developed Reserves of NGL, Barrels					155,000
Net undeveloped acres			32,000