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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Net quantities of an enterprise's interests in proved undeveloped reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other renewable 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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Supplemental Information To Financial Statements (Summary Of Net Proved Reserves) (Details)	Dec. 31, 2014 bbl Boe	Dec. 31, 2013 bbl Boe
Crude Oil (Bbls)
Reserve Quantities [Line Items]
Net Proved Developed Reserves	109,446	83,743
Net Proved Developed Reserves, Oil Equivalents
Net Proved Undeveloped Reserves	34,688	32,391
Net Proved Undeveloped Reserves, Oil Equivalents
Net Proved Developed and Undeveloped Reserves	144,134	116,134
Net Proved Developed and Undeveloped Reserves, Oil Equivalents
Natural Gas (Mcf)
Reserve Quantities [Line Items]
Net Proved Developed Reserves
Net Proved Undeveloped Reserves
Net Proved Developed and Undeveloped Reserves