Derivatives (Schedule Of Subsequent Cash Flow Hedges) (Details) (Swap [Member])	12 Months Ended
	Dec. 31, 2011 bbl
Jan'13 - Dec'13 [Member] | Crude Oil [Member] | WTI - NYMEX [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Hedged Volume (in Bbl/day)	2,000
Weighted Average Fixed Price for Swaps	102.05
Start [Member] | Jan'13 - Dec'13 [Member] | Crude Oil [Member] | WTI - NYMEX [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Commodity Derivatives Term	Jan'13
End [Member] | Jan'13 - Dec'13 [Member] | Crude Oil [Member] | WTI - NYMEX [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Commodity Derivatives Term	Dec'13
Subsequent To December 31, 2011 [Member] | Mar'12 - Dec'12 [Member] | Crude Oil [Member] | WTI - NYMEX [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Hedged Volume (in Bbl/day)	1,000
Weighted Average Fixed Price for Swaps	103.90
Subsequent To December 31, 2011 [Member] | Jan'13 - Dec'13 [Member] | Crude Oil [Member] | WTI - NYMEX [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Hedged Volume (in Bbl/day)	1,000
Weighted Average Fixed Price for Swaps	101.63
Subsequent To December 31, 2011 [Member] | Jul'12 - Sep'12 [Member] | Natural Gas [Member] | IF - NYMEX (HH) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Hedged Volume (MMBtu/day)	20,000
Weighted Average Fixed Price for Swaps	2.98
Subsequent To December 31, 2011 [Member] | Start [Member] | Mar'12 - Dec'12 [Member] | Crude Oil [Member] | WTI - NYMEX [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Commodity Derivatives Term	Mar'12
Subsequent To December 31, 2011 [Member] | Start [Member] | Jan'13 - Dec'13 [Member] | Crude Oil [Member] | WTI - NYMEX [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Commodity Derivatives Term	Jan'13
Subsequent To December 31, 2011 [Member] | Start [Member] | Jul'12 - Sep'12 [Member] | Natural Gas [Member] | IF - NYMEX (HH) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Commodity Derivatives Term	Jul'12
Subsequent To December 31, 2011 [Member] | End [Member] | Mar'12 - Dec'12 [Member] | Crude Oil [Member] | WTI - NYMEX [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Commodity Derivatives Term	Dec'12
Subsequent To December 31, 2011 [Member] | End [Member] | Jan'13 - Dec'13 [Member] | Crude Oil [Member] | WTI - NYMEX [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Commodity Derivatives Term	Dec'13
Subsequent To December 31, 2011 [Member] | End [Member] | Jul'12 - Sep'12 [Member] | Natural Gas [Member] | IF - NYMEX (HH) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Commodity Derivatives Term	Sep'12