Derivatives Derivatives (Schedule of Non-designated Hedges Outstanding) (Details) (Not Designated as Hedging Instrument [Member])	3 Months Ended
	Mar. 31, 2013 bbl
Swap [Member] | Apr'13 - Dec'13 [Member] | Crude Oil [Member] | WTI - NYMEX [Member]
Derivative [Line Items]
Weighted Average Fixed Price For Swaps	94.59
Hedged Volume (in Bbl/day)	3,000
Swap [Member] | Apr'13 - Dec'13 [Member] | Crude Oil [Member] | WTI - NYMEX [Member] | Start [Member]
Derivative [Line Items]
Commodity Derivatives Term	Apr'13
Swap [Member] | Apr'13 - Dec'13 [Member] | Crude Oil [Member] | WTI - NYMEX [Member] | End [Member]
Derivative [Line Items]
Commodity Derivatives Term	Dec'13
Swap [Member] | Apr'13 - Dec'13 [Member] | Natural Gas [Member] | IF - NYMEX (HH) [Member]
Derivative [Line Items]
Weighted Average Fixed Price For Swaps	3.94
Hedged Volume (MMBtu/day)	20,000
Swap [Member] | Apr'13 - Dec'13 [Member] | Natural Gas [Member] | IF - NYMEX (HH) [Member] | Start [Member]
Derivative [Line Items]
Commodity Derivatives Term	Apr'13
Swap [Member] | Apr'13 - Dec'13 [Member] | Natural Gas [Member] | IF - NYMEX (HH) [Member] | End [Member]
Derivative [Line Items]
Commodity Derivatives Term	Dec'13
Swap [Member] | Jan'14 - Dec'14 [Member] | Crude Oil [Member] | WTI - NYMEX [Member]
Derivative [Line Items]
Weighted Average Fixed Price For Swaps	91.40
Hedged Volume (in Bbl/day)	2,000
Swap [Member] | Jan'14 - Dec'14 [Member] | Crude Oil [Member] | WTI - NYMEX [Member] | Start [Member]
Derivative [Line Items]
Commodity Derivatives Term	Jan'14
Swap [Member] | Jan'14 - Dec'14 [Member] | Crude Oil [Member] | WTI - NYMEX [Member] | End [Member]
Derivative [Line Items]
Commodity Derivatives Term	Dec'14
Swap [Member] | Jan'14 - Dec'14 [Member] | Natural Gas [Member] | IF - NYMEX (HH) [Member]
Derivative [Line Items]
Weighted Average Fixed Price For Swaps	4.19
Hedged Volume (MMBtu/day)	30,000
Swap [Member] | Jan'14 - Dec'14 [Member] | Natural Gas [Member] | IF - NYMEX (HH) [Member] | Start [Member]
Derivative [Line Items]
Commodity Derivatives Term	Jan'14
Swap [Member] | Jan'14 - Dec'14 [Member] | Natural Gas [Member] | IF - NYMEX (HH) [Member] | End [Member]
Derivative [Line Items]
Commodity Derivatives Term	Dec'14
Swap [Member] | Jan'14 - Dec'14 [Member] | Natural Gas [Member] | IF - NYMEX (HH) [Member] | Subsequent Event [Member]
Derivative [Line Items]
Weighted Average Fixed Price For Swaps	4.33
Hedged Volume (MMBtu/day)	20,000
Swap [Member] | Jan'14 - Dec'14 [Member] | Natural Gas [Member] | IF - NYMEX (HH) [Member] | Subsequent Event [Member] | Start [Member]
Derivative [Line Items]
Commodity Derivatives Term	Jan'14
Swap [Member] | Jan'14 - Dec'14 [Member] | Natural Gas [Member] | IF - NYMEX (HH) [Member] | Subsequent Event [Member] | End [Member]
Derivative [Line Items]
Commodity Derivatives Term	Dec'14
Collar [Member] | Jan'14 - Dec'14 [Member] | Crude Oil [Member] | WTI - NYMEX [Member]
Derivative [Line Items]
Hedged Volume (in Bbl/day)	2,000
Collar [Member] | Jan'14 - Dec'14 [Member] | Crude Oil [Member] | WTI - NYMEX [Member] | Start [Member]
Derivative [Line Items]
Weighted Average Fixed Price For Swaps	90.00
Commodity Derivatives Term	Jan'14
Collar [Member] | Jan'14 - Dec'14 [Member] | Crude Oil [Member] | WTI - NYMEX [Member] | End [Member]
Derivative [Line Items]
Weighted Average Fixed Price For Swaps	95.00
Commodity Derivatives Term	Dec'14