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Oil and Natural Gas Property Transactions - VPP Volumes Produced During Period Table (Details)
Mcfe in Millions, Mcf in Millions
3 Months Ended
Mar. 31, 2016
Mcfe
MBbls
Mcf
Mar. 31, 2015
Mcfe
MBbls
Mcf
VPP Volumes Produced During Period [Line Items]    
Proved Developed and Undeveloped Reserve, Production (Energy) | Mcfe 15.3 31.3
Oil [Member]    
VPP Volumes Produced During Period [Line Items]    
Proved Developed and Undeveloped Reserves, Production 115,500 137,600
Natural Gas [Member]    
VPP Volumes Produced During Period [Line Items]    
Proved Developed and Undeveloped Reserves, Production | Mcf 12.8 28.3
Natural Gas Liquids [Member]    
VPP Volumes Produced During Period [Line Items]    
Proved Developed and Undeveloped Reserves, Production 312,000 373,300
VPP 10 Anadarko Basin Granite Wash [Member]    
VPP Volumes Produced During Period [Line Items]    
Proved Developed and Undeveloped Reserve, Production (Energy) | Mcfe 3.5 4.4
VPP 10 Anadarko Basin Granite Wash [Member] | Oil [Member]    
VPP Volumes Produced During Period [Line Items]    
Proved Developed and Undeveloped Reserves, Production 66,000 83,000
VPP 10 Anadarko Basin Granite Wash [Member] | Natural Gas [Member]    
VPP Volumes Produced During Period [Line Items]    
Proved Developed and Undeveloped Reserves, Production | Mcf 1.8 2.2
VPP 10 Anadarko Basin Granite Wash [Member] | Natural Gas Liquids [Member]    
VPP Volumes Produced During Period [Line Items]    
Proved Developed and Undeveloped Reserves, Production 222,700 276,300
VPP 9 Mid-Continent [Member]    
VPP Volumes Produced During Period [Line Items]    
Proved Developed and Undeveloped Reserve, Production (Energy) | Mcfe 4.1 4.5
VPP 9 Mid-Continent [Member] | Oil [Member]    
VPP Volumes Produced During Period [Line Items]    
Proved Developed and Undeveloped Reserves, Production 39,400 43,600
VPP 9 Mid-Continent [Member] | Natural Gas [Member]    
VPP Volumes Produced During Period [Line Items]    
Proved Developed and Undeveloped Reserves, Production | Mcf 3.4 3.7
VPP 9 Mid-Continent [Member] | Natural Gas Liquids [Member]    
VPP Volumes Produced During Period [Line Items]    
Proved Developed and Undeveloped Reserves, Production 89,300 97,000
VPP 8 Barnett Shale [Member]    
VPP Volumes Produced During Period [Line Items]    
Proved Developed and Undeveloped Reserve, Production (Energy) | Mcfe   14.0
VPP 8 Barnett Shale [Member] | Oil [Member]    
VPP Volumes Produced During Period [Line Items]    
Proved Developed and Undeveloped Reserves, Production   0
VPP 8 Barnett Shale [Member] | Natural Gas [Member]    
VPP Volumes Produced During Period [Line Items]    
Proved Developed and Undeveloped Reserves, Production | Mcf   14.0
VPP 8 Barnett Shale [Member] | Natural Gas Liquids [Member]    
VPP Volumes Produced During Period [Line Items]    
Proved Developed and Undeveloped Reserves, Production   0
VPP 4 Anadarko and Arkoma Basins [Member]    
VPP Volumes Produced During Period [Line Items]    
Proved Developed and Undeveloped Reserve, Production (Energy) | Mcfe 2.0 2.1
VPP 4 Anadarko and Arkoma Basins [Member] | Oil [Member]    
VPP Volumes Produced During Period [Line Items]    
Proved Developed and Undeveloped Reserves, Production 10,100 11,000
VPP 4 Anadarko and Arkoma Basins [Member] | Natural Gas [Member]    
VPP Volumes Produced During Period [Line Items]    
Proved Developed and Undeveloped Reserves, Production | Mcf 1.9 2.1
VPP 4 Anadarko and Arkoma Basins [Member] | Natural Gas Liquids [Member]    
VPP Volumes Produced During Period [Line Items]    
Proved Developed and Undeveloped Reserves, Production 0 0
VPP 3 Anadarko Basin [Member]    
VPP Volumes Produced During Period [Line Items]    
Proved Developed and Undeveloped Reserve, Production (Energy) | Mcfe 1.5 1.7
VPP 3 Anadarko Basin [Member] | Oil [Member]    
VPP Volumes Produced During Period [Line Items]    
Proved Developed and Undeveloped Reserves, Production 0 0
VPP 3 Anadarko Basin [Member] | Natural Gas [Member]    
VPP Volumes Produced During Period [Line Items]    
Proved Developed and Undeveloped Reserves, Production | Mcf 1.5 1.7
VPP 3 Anadarko Basin [Member] | Natural Gas Liquids [Member]    
VPP Volumes Produced During Period [Line Items]    
Proved Developed and Undeveloped Reserves, Production 0 0
VPP 2 Texas, Oklahoma and Kansas [Member]    
VPP Volumes Produced During Period [Line Items]    
Proved Developed and Undeveloped Reserve, Production (Energy) | Mcfe 0.9 1.1
VPP 2 Texas, Oklahoma and Kansas [Member] | Oil [Member]    
VPP Volumes Produced During Period [Line Items]    
Proved Developed and Undeveloped Reserves, Production 0 0
VPP 2 Texas, Oklahoma and Kansas [Member] | Natural Gas [Member]    
VPP Volumes Produced During Period [Line Items]    
Proved Developed and Undeveloped Reserves, Production | Mcf 0.9 1.1
VPP 2 Texas, Oklahoma and Kansas [Member] | Natural Gas Liquids [Member]    
VPP Volumes Produced During Period [Line Items]    
Proved Developed and Undeveloped Reserves, Production 0 0
VPP 1 Kentucky and West Virginia [Member]    
VPP Volumes Produced During Period [Line Items]    
Proved Developed and Undeveloped Reserve, Production (Energy) | Mcfe 3.3 3.5
VPP 1 Kentucky and West Virginia [Member] | Oil [Member]    
VPP Volumes Produced During Period [Line Items]    
Proved Developed and Undeveloped Reserves, Production 0 0
VPP 1 Kentucky and West Virginia [Member] | Natural Gas [Member]    
VPP Volumes Produced During Period [Line Items]    
Proved Developed and Undeveloped Reserves, Production | Mcf 3.3 3.5
VPP 1 Kentucky and West Virginia [Member] | Natural Gas Liquids [Member]    
VPP Volumes Produced During Period [Line Items]    
Proved Developed and Undeveloped Reserves, Production 0 0