Derivatives (Schedule Of Subsequent Non-designated Hedges) (Details) (Crude Oil [Member], WTI - NYMEX [Member])	12 Months Ended
	Dec. 31, 2012
Subsequent to December 31, 2012 [Member] | Start [Member] | Feb'13 - Dec'13 [Member] | Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Commodity Derivatives Term	Feb'13
Subsequent to December 31, 2012 [Member] | Start [Member] | Jan'14 - Dec'14 [Member] | Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Commodity Derivatives Term	Jan'14
Subsequent to December 31, 2012 [Member] | Start [Member] | Jan'14 - Dec'14 [Member] | Collar [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Commodity Derivatives Term	Jan'14
Subsequent to December 31, 2012 [Member] | Start [Member] | Jan'14 - Dec'14 [Member] | Collar [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Weighted Average Fixed Price for Swaps	90.00
Subsequent to December 31, 2012 [Member] | End [Member] | Feb'13 - Dec'13 [Member] | Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Commodity Derivatives Term	Dec'13
Subsequent to December 31, 2012 [Member] | End [Member] | Jan'14 - Dec'14 [Member] | Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Commodity Derivatives Term	Dec'14
Subsequent to December 31, 2012 [Member] | End [Member] | Jan'14 - Dec'14 [Member] | Collar [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Commodity Derivatives Term	Dec'14
Subsequent to December 31, 2012 [Member] | End [Member] | Jan'14 - Dec'14 [Member] | Collar [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Weighted Average Fixed Price for Swaps	95.00
Not Designated as Hedging Instrument [Member] | Jan'14 - Dec'14 [Member] | Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Hedged Volume (in Bbl/day)	1,000
Weighted Average Fixed Price for Swaps	90.60
Not Designated as Hedging Instrument [Member] | Start [Member] | Jan'14 - Dec'14 [Member] | Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Commodity Derivatives Term	Jan'14
Not Designated as Hedging Instrument [Member] | End [Member] | Jan'14 - Dec'14 [Member] | Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Commodity Derivatives Term	Dec'14
Not Designated as Hedging Instrument [Member] | Subsequent to December 31, 2012 [Member] | Feb'13 - Dec'13 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Weighted Average Fixed Price for Swaps	96.58
Not Designated as Hedging Instrument [Member] | Subsequent to December 31, 2012 [Member] | Feb'13 - Dec'13 [Member] | Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Hedged Volume (in Bbl/day)	2,000
Not Designated as Hedging Instrument [Member] | Subsequent to December 31, 2012 [Member] | Jan'14 - Dec'14 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Weighted Average Fixed Price for Swaps	92.20
Not Designated as Hedging Instrument [Member] | Subsequent to December 31, 2012 [Member] | Jan'14 - Dec'14 [Member] | Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Hedged Volume (in Bbl/day)	1,000
Not Designated as Hedging Instrument [Member] | Subsequent to December 31, 2012 [Member] | Jan'14 - Dec'14 [Member] | Collar [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Hedged Volume (in Bbl/day)	2,000