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Derivatives (Cash Flow Hedges Outstanding) (Details)
9 Months Ended
Sep. 30, 2011
bbl
Swap [Member] | WTI - NYMEX [Member] | Crude Oil [Member] | Oct'11 - Dec'11 [Member]
 
Hedged Volume (in Bbl/day)4,000
Weighted Average Fixed Price for Swaps84.28
Swap [Member] | WTI - NYMEX [Member] | Crude Oil [Member] | Oct'11 - Dec'11 [Member] | Start [Member]
 
Commodity Derivatives TermOct'11
Swap [Member] | WTI - NYMEX [Member] | Crude Oil [Member] | Oct'11 - Dec'11 [Member] | End [Member]
 
Commodity Derivatives TermDec'11
Swap [Member] | WTI - NYMEX [Member] | Crude Oil [Member] | Jan'12 - Dec'12 [Member]
 
Hedged Volume (in Bbl/day)4,500
Weighted Average Fixed Price for Swaps95.91
Swap [Member] | WTI - NYMEX [Member] | Crude Oil [Member] | Jan'12 - Dec'12 [Member] | Start [Member]
 
Commodity Derivatives TermJan'12
Swap [Member] | WTI - NYMEX [Member] | Crude Oil [Member] | Jan'12 - Dec'12 [Member] | End [Member]
 
Commodity Derivatives TermDec'12
Swap [Member] | WTI - NYMEX [Member] | Crude Oil [Member] | Jan'13 - Dec'13 [Member]
 
Hedged Volume (in Bbl/day)2,000
Weighted Average Fixed Price for Swaps102.05
Swap [Member] | WTI - NYMEX [Member] | Crude Oil [Member] | Jan'13 - Dec'13 [Member] | Start [Member]
 
Commodity Derivatives TermJan'13
Swap [Member] | WTI - NYMEX [Member] | Crude Oil [Member] | Jan'13 - Dec'13 [Member] | End [Member]
 
Commodity Derivatives TermDec'13
Swap [Member] | CEGT - NYMEX [Member] | Natural Gas [Member] | Oct'11 - Dec'11 [Member]
 
Hedged Volume (MMBtu/day)10,000
Weighted Average Fixed Price for Swaps4.43
Swap [Member] | CEGT - NYMEX [Member] | Natural Gas [Member] | Oct'11 - Dec'11 [Member] | Start [Member]
 
Commodity Derivatives TermOct'11
Swap [Member] | CEGT - NYMEX [Member] | Natural Gas [Member] | Oct'11 - Dec'11 [Member] | End [Member]
 
Commodity Derivatives TermDec'11
Swap [Member] | IF - NYMEX (HH) [Member] | Natural Gas [Member] | Oct'11 - Dec'11 [Member]
 
Hedged Volume (MMBtu/day)70,000
Weighted Average Fixed Price for Swaps4.87
Swap [Member] | IF - NYMEX (HH) [Member] | Natural Gas [Member] | Oct'11 - Dec'11 [Member] | Start [Member]
 
Commodity Derivatives TermOct'11
Swap [Member] | IF - NYMEX (HH) [Member] | Natural Gas [Member] | Oct'11 - Dec'11 [Member] | End [Member]
 
Commodity Derivatives TermDec'11
Swap [Member] | IF - NYMEX (HH) [Member] | Natural Gas [Member] | Jan'12 - Dec'12 [Member]
 
Hedged Volume (MMBtu/day)30,000
Weighted Average Fixed Price for Swaps5.05
Swap [Member] | IF - NYMEX (HH) [Member] | Natural Gas [Member] | Jan'12 - Dec'12 [Member] | Start [Member]
 
Commodity Derivatives TermJan'12
Swap [Member] | IF - NYMEX (HH) [Member] | Natural Gas [Member] | Jan'12 - Dec'12 [Member] | End [Member]
 
Commodity Derivatives TermDec'12
Swap [Member] | IF - PEPL [Member] | Natural Gas [Member] | Jan'12 - Dec'12 [Member]
 
Hedged Volume (MMBtu/day)15,000
Weighted Average Fixed Price for Swaps5.62
Swap [Member] | IF - PEPL [Member] | Natural Gas [Member] | Jan'12 - Dec'12 [Member] | Start [Member]
 
Commodity Derivatives TermJan'12
Swap [Member] | IF - PEPL [Member] | Natural Gas [Member] | Jan'12 - Dec'12 [Member] | End [Member]
 
Commodity Derivatives TermDec'12
Swap [Member] | OPIS - Conway [Member] | Liquids [Member] | Oct'11 - Dec'11 [Member]
 
Hedged Volume (Gal/mo)2,024,418[1]
Weighted Average Fixed Price for Swaps1.07[1]
Swap [Member] | OPIS - Conway [Member] | Liquids [Member] | Oct'11 - Dec'11 [Member] | Start [Member]
 
Commodity Derivatives TermOct'11
Swap [Member] | OPIS - Conway [Member] | Liquids [Member] | Oct'11 - Dec'11 [Member] | End [Member]
 
Commodity Derivatives TermDec'11
Swap [Member] | OPIS - Conway [Member] | Liquids [Member] | Jan'12 - Mar'12 [Member]
 
Hedged Volume (Gal/mo)1,350,014[1]
Weighted Average Fixed Price for Swaps1.10[1]
Swap [Member] | OPIS - Conway [Member] | Liquids [Member] | Jan'12 - Mar'12 [Member] | Start [Member]
 
Commodity Derivatives TermJan'12
Swap [Member] | OPIS - Conway [Member] | Liquids [Member] | Jan'12 - Mar'12 [Member] | End [Member]
 
Commodity Derivatives TermMar'12
Swap [Member] | OPIS - Conway [Member] | Liquids [Member] | Apr'12 - Dec'12 [Member]
 
Hedged Volume (Gal/mo)180,006[2]
Weighted Average Fixed Price for Swaps2.11[2]
Swap [Member] | OPIS - Conway [Member] | Liquids [Member] | Apr'12 - Dec'12 [Member] | Start [Member]
 
Commodity Derivatives TermApr'12
Swap [Member] | OPIS - Conway [Member] | Liquids [Member] | Apr'12 - Dec'12 [Member] | End [Member]
 
Commodity Derivatives TermDec'12
Swap [Member] | OPIS - Mont Belvieu [Member] | Liquids [Member] | Oct'11 - Dec'11 [Member]
 
Hedged Volume (Gal/mo)1,240,068[1]
Weighted Average Fixed Price for Swaps1.00[1]
Swap [Member] | OPIS - Mont Belvieu [Member] | Liquids [Member] | Oct'11 - Dec'11 [Member] | Start [Member]
 
Commodity Derivatives TermOct'11
Swap [Member] | OPIS - Mont Belvieu [Member] | Liquids [Member] | Oct'11 - Dec'11 [Member] | End [Member]
 
Commodity Derivatives TermDec'11
Swap [Member] | OPIS - Mont Belvieu [Member] | Liquids [Member] | Jan'12 - Mar'12 [Member]
 
Hedged Volume (Gal/mo)1,155,018[1]
Weighted Average Fixed Price for Swaps0.91[1]
Swap [Member] | OPIS - Mont Belvieu [Member] | Liquids [Member] | Jan'12 - Mar'12 [Member] | Start [Member]
 
Commodity Derivatives TermJan'12
Swap [Member] | OPIS - Mont Belvieu [Member] | Liquids [Member] | Jan'12 - Mar'12 [Member] | End [Member]
 
Commodity Derivatives TermMar'12
Swap [Member] | OPIS - Mont Belvieu [Member] | Liquids [Member] | Apr'12 - Jun'12 [Member]
 
Hedged Volume (Gal/mo)690,028[3]
Weighted Average Fixed Price for Swaps0.79[3]
Swap [Member] | OPIS - Mont Belvieu [Member] | Liquids [Member] | Apr'12 - Jun'12 [Member] | Start [Member]
 
Commodity Derivatives TermApr'12
Swap [Member] | OPIS - Mont Belvieu [Member] | Liquids [Member] | Apr'12 - Jun'12 [Member] | End [Member]
 
Commodity Derivatives TermJun'12
Basis Swap [Member] | CEGT - NYMEX [Member] | Natural Gas [Member] | Oct'11 - Dec'11 [Member] | Start [Member]
 
Commodity Derivatives TermOct'11
Basis Swap [Member] | CEGT - NYMEX [Member] | Natural Gas [Member] | Oct'11 - Dec'11 [Member] | End [Member]
 
Commodity Derivatives TermDec'11
Basis Swap [Member] | Tenn Zone - NYMEX [Member] | Natural Gas [Member] | Oct'11 - Dec'11 [Member]
 
Hedged Volume (MMBtu/day)15,000
Weighted Average Fixed Price for Swaps(0.14)
Basis Swap [Member] | Tenn Zone - NYMEX [Member] | Natural Gas [Member] | Oct'11 - Dec'11 [Member] | Start [Member]
 
Commodity Derivatives TermOct'11
Basis Swap [Member] | Tenn Zone - NYMEX [Member] | Natural Gas [Member] | Oct'11 - Dec'11 [Member] | End [Member]
 
Commodity Derivatives TermDec'11
[1]Types of liquids involved are natural gasoline, ethane, propane, isobutane and normal butane.
[2]Types of liquids involved are natural gasoline.
[3]Types of liquids involved are natural gasoline and ethane.