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Supplemental Information on Oil and Natural Gas Producing Activities - Summary of Changes in Estimated Oil and Natural Gas Reserves - Noncontrolling Interests (Unaudited) (Parenthetical) (Details) | Dec. 31, 2013 MBbls | Dec. 31, 2012 MBbls | Dec. 31, 2011 MBbls | Dec. 31, 2010 MBbls
--- | --- | --- | --- | ---
Oil Reserves |  |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |  |
Proved Developed and Undeveloped Reserves, Net | 142,641 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_OilReservesMember | [1] | 262,045 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_OilReservesMember | [1] | 214,450 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_OilReservesMember | [1] | 205,023 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_OilReservesMember
Natural Gas Liquids |  |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |  |
Proved Developed and Undeveloped Reserves, Net | 59,052 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_NaturalGasLiquidsReservesMember | [1] | 67,994 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_NaturalGasLiquidsReservesMember | [1] | 30,335 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_NaturalGasLiquidsReservesMember | [1] | 47,091 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_NaturalGasLiquidsReservesMember
Natural Gas Reserves |  |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |  |
Proved Developed and Undeveloped Reserves, Net | 1,390,429 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_NaturalGasReservesMember | [1] | 1,415,042 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_NaturalGasReservesMember | [1] | 1,355,056 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_NaturalGasReservesMember | [1] | 1,762,665 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_NaturalGasReservesMember
Noncontrolling Interest | Oil Reserves |  |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |  |
Proved Developed and Undeveloped Reserves, Net | 13,569 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_OilReservesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  | 17,340 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_OilReservesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  | 17,018 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_OilReservesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |
Noncontrolling Interest | Natural Gas Liquids |  |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |  |
Proved Developed and Undeveloped Reserves, Net | 4,737 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_NaturalGasLiquidsReservesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  | 5,132 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_NaturalGasLiquidsReservesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  | 1,782 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_NaturalGasLiquidsReservesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |
Noncontrolling Interest | Natural Gas Reserves |  |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |  |
Proved Developed and Undeveloped Reserves, Net | 69,693 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_NaturalGasReservesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  | 94,543 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_NaturalGasReservesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  | 45,500 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_NaturalGasReservesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |
[1] | Includes proved reserves attributable to noncontrolling interests at December 31, 2013, 2012 and 2011 as shown in the table below: December 31, 2013 2012 2011Oil (MBbl)13,569 17,340 17,018NGL (MBbl)4,737 5,132 1,782Natural gas (MMcf)69,693 94,543 45,500

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61831-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(a)(2)) -URI http://asc.fasb.org/extlink&oid=27015464&loc=d3e511914-122862 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 10 -Paragraph a -Subparagraph 2 -Article 4 + Details
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