Supplemental Information On Oil And Gas Operations (Proved Natural Gas Reserves) (Details)	12 Months Ended
Dec. 31, 2014 MMcf	Dec. 31, 2013 MMcf	Dec. 31, 2012 MMcf	Dec. 31, 2011 MMcf
Reserve Quantities [Line Items]
Conversion rate of gas reserves from barrels of oil to Boe	6
Natural Gas [Member]
Reserve Quantities [Line Items]
Proved developed and undeveloped reserves, beginning balance	9,308,000	9,446,000	10,486,000
Proved developed and undeveloped reserves, revisions due to prices	236,000	566,000	(930,000)
Proved developed and undeveloped reserves, revisions other than price	(295,000)	(232,000)	(320,000)
Proved developed and undeveloped reserves, extensions and discoveries	343,000	490,000	1,158,000
Proved developed and undeveloped reserves, purchase of reserves	457,000	1,000	2,000
Proved developed and undeveloped reserves, production	(701,000)	(874,000)	(938,000)
Proved developed and undeveloped reserves, sale of reserves	(1,661,000)	(89,000)	(12,000)
Proved developed and undeveloped reserves, ending balance	7,687,000	9,308,000	9,446,000
Proved developed reserves	6,984,000	8,459,000	8,070,000	8,908,000
Proved developed producing reserves	6,780,000	8,105,000	7,715,000	8,271,000
Proved undeveloped reserve	703,000	849,000	1,376,000	1,578,000
Natural Gas [Member] \| United States [Member]
Reserve Quantities [Line Items]
Proved developed and undeveloped reserves, beginning balance	8,550,000	8,762,000	9,507,000
Proved developed and undeveloped reserves, revisions due to prices	191,000	405,000	(831,000)
Proved developed and undeveloped reserves, revisions other than price	(299,000)	(299,000)	(287,000)
Proved developed and undeveloped reserves, extensions and discoveries	335,000	471,000	1,124,000
Proved developed and undeveloped reserves, purchase of reserves	457,000	1,000	2,000
Proved developed and undeveloped reserves, production	(660,000)	(709,000)	(752,000)
Proved developed and undeveloped reserves, sale of reserves	(923,000)	(81,000)	(1,000)
Proved developed and undeveloped reserves, ending balance	7,651,000	8,550,000	8,762,000
Proved developed reserves	6,948,000	7,707,000	7,391,000	7,957,000
Proved developed producing reserves	6,746,000	7,425,000	7,091,000	7,409,000
Proved undeveloped reserve	703,000	843,000	1,371,000	1,550,000
Natural Gas [Member] \| Canada [Member]
Reserve Quantities [Line Items]
Proved developed and undeveloped reserves, beginning balance	758,000	684,000	979,000
Proved developed and undeveloped reserves, revisions due to prices	45,000	161,000	(99,000)
Proved developed and undeveloped reserves, revisions other than price	4,000	67,000	(33,000)
Proved developed and undeveloped reserves, extensions and discoveries	8,000	19,000	34,000
Proved developed and undeveloped reserves, production	(41,000)	(165,000)	(186,000)
Proved developed and undeveloped reserves, sale of reserves	(738,000)	(8,000)	(11,000)
Proved developed and undeveloped reserves, ending balance	36,000	758,000	684,000
Proved developed reserves	36,000	752,000	679,000	951,000
Proved developed producing reserves	34,000	680,000	624,000	862,000
Proved undeveloped reserve		6,000	5,000	28,000

Conversion Rate Of Gas Reserves From Mcf To Boe

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Proved Developed And Undeveloped Reserves Revisions Due To Prices

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Proved Developed Producing Reserves Volume

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Additions to proved reserves that result from (1) extension of the proved acreage of previously discovered (old) reservoirs through additional drilling in periods after discovery and (2) discovery of new fields with proved reserves or of new reservoirs of proved reserves in old fields.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

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The net quantity of proved reserves as of the balance sheet date. Proved oil reserves are the estimated quantities of crude oil and natural gas liquids which geological and engineering data demonstrate with reasonable certainty to be recoverable.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 10

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Production of proved reserves.

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Purchase of minerals in place.

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-SubTopic 235

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Revisions represent changes in previous estimates of proved reserves, either upward or downward, resulting from new information (except for an increase in proved acreage) normally obtained from development drilling and production history or resulting from change in economic factors.

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Sales of minerals in place.

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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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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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