Physical Delivery Contracts and Commodity Derivatives (Details)	Sep. 30, 2014
Summary of swap agreements
Quantity
Weighted Average Price
Swap [Member] | Oct - Dec 2014 [Member] | Natural Gas [Member] | NYMEX Henry Hub Natural Gas Futures Contract [Member]
Summary of swap agreements
Quantity	250,000
Weighted Average Price	4.16	[1]
Swap [Member] | Oct - Dec 2014 [Member] | Oil [Member] | NYMEX Light Sweet Crude West Texas Intermediate Futures Contract [Member]
Summary of swap agreements
Quantity	12,000
Weighted Average Price	93.79	[2]
Swap [Member] | Jan - Mar 2015 [Member] | Natural Gas [Member] | NYMEX Henry Hub Natural Gas Futures Contract [Member]
Summary of swap agreements
Quantity	220,000
Weighted Average Price	4.06	[1]
Swap [Member] | Jan - Mar 2015 [Member] | Oil [Member] | NYMEX Light Sweet Crude West Texas Intermediate Futures Contract [Member]
Summary of swap agreements
Quantity	5,000
Weighted Average Price	94.52	[2]
Swap [Member] | Apr - Jun 2015 [Member] | Natural Gas [Member] | NYMEX Henry Hub Natural Gas Futures Contract [Member]
Summary of swap agreements
Quantity	170,000
Weighted Average Price	4.04	[1]
Swap [Member] | Apr - Jun 2015 [Member] | Oil [Member] | NYMEX Light Sweet Crude West Texas Intermediate Futures Contract [Member]
Summary of swap agreements
Quantity	3,000
Weighted Average Price	94.80	[2]
Swap [Member] | Jul - Sep 2015 [Member] | Natural Gas [Member] | NYMEX Henry Hub Natural Gas Futures Contract [Member]
Summary of swap agreements
Quantity	180,000
Weighted Average Price	4.05	[1]
Swap [Member] | Jul - Sep 2015 [Member] | Oil [Member] | NYMEX Light Sweet Crude West Texas Intermediate Futures Contract [Member]
Summary of swap agreements
Quantity	2,000
Weighted Average Price	94.80	[2]
Swap [Member] | Oct - Dec 2015 [Member] | Natural Gas [Member] | NYMEX Henry Hub Natural Gas Futures Contract [Member]
Summary of swap agreements
Quantity	180,000
Weighted Average Price	4.05	[1]
Swap [Member] | Oct - Dec 2015 [Member] | Oil [Member] | NYMEX Light Sweet Crude West Texas Intermediate Futures Contract [Member]
Summary of swap agreements
Quantity
Weighted Average Price
Swap [Member] | Jan - Mar 2016 [Member] | Natural Gas [Member] | NYMEX Henry Hub Natural Gas Futures Contract [Member]
Summary of swap agreements
Quantity	30,000
Weighted Average Price	4.20	[1]
Swap [Member] | Jan - Mar 2016 [Member] | Oil [Member] | NYMEX Light Sweet Crude West Texas Intermediate Futures Contract [Member]
Summary of swap agreements
Quantity
Weighted Average Price
Swap [Member] | Apr - Jun 2016 [Member] | Natural Gas [Member] | NYMEX Henry Hub Natural Gas Futures Contract [Member]
Summary of swap agreements
Quantity	10,000
Weighted Average Price	4.20	[1]
Swap [Member] | Apr - Jun 2016 [Member] | Oil [Member] | NYMEX Light Sweet Crude West Texas Intermediate Futures Contract [Member]
Summary of swap agreements
Quantity
Weighted Average Price
Commodity derivative contracts [Member] | Oct - Dec 2015 [Member]
Summary of swap agreements
Quantity	1,000
Weighted Average Price	96.70

[1] NYMEX Henry Hub Natural Gas futures contract for the respective delivery month.

[2] NYMEX Light Sweet Crude West Texas Intermediate futures contract for the respective delivery month.