Subsequent Events (Details)	12 Months Ended
	Dec. 31, 2012
Oil contract 1 [Member] | Costless Collar Contracts [Member]
Open Costless Collar Contracts For Natural Gas
Calculation Period	07/01/2013 - 12/31/2013
Notional Quantity	20,000
Price Floor	90.00
Price Ceiling	102.80
Oil contract 2 [Member] | Costless Collar Contracts [Member]
Open Costless Collar Contracts For Natural Gas
Calculation Period	01/01/2014 - 12/31/2014
Notional Quantity	15,000
Price Floor	85.00
Price Ceiling	97.50
Oil contract 3 [Member] | Costless Collar Contracts [Member]
Open Costless Collar Contracts For Natural Gas
Calculation Period	01/01/2014 - 12/31/2014
Notional Quantity	30,000
Price Floor	85.00
Price Ceiling	98.00
Oil contract 4 [Member] | Costless Collar Contracts [Member]
Open Costless Collar Contracts For Natural Gas
Calculation Period	01/01/2014 - 12/31/2014
Notional Quantity	15,000
Price Floor	87.00
Price Ceiling	97.00
Oil contract 5 [Member] | Costless Collar Contracts [Member]
Open Costless Collar Contracts For Natural Gas
Calculation Period	01/01/2014 - 12/31/2014
Notional Quantity	20,000
Price Floor	90.00
Price Ceiling	97.00
Oil contract 6 [Member] | Costless Collar Contracts [Member]
Open Costless Collar Contracts For Natural Gas
Calculation Period	01/01/2014 - 12/31/2014
Notional Quantity	15,000
Price Floor	90.00
Price Ceiling	97.90
Oil contract 7 [Member] | Costless Collar Contracts [Member]
Open Costless Collar Contracts For Natural Gas
Calculation Period	01/01/2014 - 12/31/2014
Notional Quantity	15,000
Price Floor	90.00
Price Ceiling	98.00
Natural Gas contract 1 [Member] | Costless Collar Contracts [Member]
Open Costless Collar Contracts For Natural Gas
Calculation Period	04/01/2013 - 12/31/2013
Notional Quantity	100,000
Price Floor	3.25
Price Ceiling	4.41
Natural Gas contract 2 [Member] | Costless Collar Contracts [Member]
Open Costless Collar Contracts For Natural Gas
Calculation Period	04/01/2013 - 12/31/2013
Notional Quantity	100,000
Price Floor	3.25
Price Ceiling	4.44
Natural Gas contract 3 [Member] | Costless Collar Contracts [Member]
Open Costless Collar Contracts For Natural Gas
Calculation Period	04/01/2013 - 12/31/2013
Notional Quantity	100,000
Price Floor	3.50
Price Ceiling	4.37
Natural Gas contract 4 [Member] | Costless Collar Contracts [Member]
Open Costless Collar Contracts For Natural Gas
Calculation Period	07/01/2013 - 12/31/2013
Notional Quantity	150,000
Price Floor	3.00
Price Ceiling	4.24
Natural Gas contract 5 [Member] | Costless Collar Contracts [Member]
Open Costless Collar Contracts For Natural Gas
Calculation Period	01/01/2014 - 12/31/2014
Notional Quantity	100,000
Price Floor	3.00
Price Ceiling	5.15
Natural Gas contract 6 [Member] | Costless Collar Contracts [Member]
Open Costless Collar Contracts For Natural Gas
Calculation Period	01/01/2014 - 12/31/2014
Notional Quantity	150,000
Price Floor	3.25
Price Ceiling	5.21
Natural Gas contract 7 [Member] | Costless Collar Contracts [Member]
Open Costless Collar Contracts For Natural Gas
Calculation Period	01/01/2014 - 12/31/2014
Notional Quantity	100,000
Price Floor	3.25
Price Ceiling	5.22
Natural Gas contract 8 [Member] | Costless Collar Contracts [Member]
Open Costless Collar Contracts For Natural Gas
Calculation Period	01/01/2014 - 12/31/2014
Notional Quantity	100,000
Price Floor	3.50
Price Ceiling	4.90
Normal Butane Contract 1 [Member] | Swap [Member]
Open Costless Collar Contracts For Natural Gas
Calculation Period	03/01/2013 - 12/31/2013
Notional Quantity	21,000
Commodity Fixed Price	1.575
Normal Butane Contract 2 [Member] | Swap [Member]
Open Costless Collar Contracts For Natural Gas
Calculation Period	03/01/2013 - 12/31/2013
Notional Quantity	117,000
Commodity Fixed Price	1.575
Normal Butane Contract 3 [Member] | Swap [Member]
Open Costless Collar Contracts For Natural Gas
Calculation Period	01/01/2014 - 12/31/2014
Notional Quantity	17,500
Commodity Fixed Price	1.540
Normal Butane Contract 4 [Member] | Swap [Member]
Open Costless Collar Contracts For Natural Gas
Calculation Period	01/01/2014 - 12/31/2014
Notional Quantity	45,500
Commodity Fixed Price	1.550
Isobutane Contract 1 [Member] | Swap [Member]
Open Costless Collar Contracts For Natural Gas
Calculation Period	03/01/2013 - 12/31/2013
Notional Quantity	43,500
Commodity Fixed Price	1.675
Isobutane Contract 2 [Member] | Swap [Member]
Open Costless Collar Contracts For Natural Gas
Calculation Period	03/01/2013 - 12/31/2013
Notional Quantity	23,000
Commodity Fixed Price	1.675
Isobutane Contract 3 [Member] | Swap [Member]
Open Costless Collar Contracts For Natural Gas
Calculation Period	01/01/2014 - 12/31/2014
Notional Quantity	22,000
Commodity Fixed Price	1.640
Isobutane Contract 4 [Member] | Swap [Member]
Open Costless Collar Contracts For Natural Gas
Calculation Period	01/01/2014 - 12/31/2014
Notional Quantity	37,000
Commodity Fixed Price	1.640
Natural Gasoline Contract 1 [Member] | Swap [Member]
Open Costless Collar Contracts For Natural Gas
Calculation Period	03/01/2013 - 12/31/2013
Notional Quantity	36,000
Commodity Fixed Price	2.105
Natural Gasoline Contract 2 [Member] | Swap [Member]
Open Costless Collar Contracts For Natural Gas
Calculation Period	03/01/2013 - 12/31/2013
Notional Quantity	90,500
Commodity Fixed Price	2.148
Natural Gasoline Contract 3 [Member] | Swap [Member]
Open Costless Collar Contracts For Natural Gas
Calculation Period	01/01/2014 - 12/31/2014
Notional Quantity	30,000
Commodity Fixed Price	1.970
Natural Gasoline Contract 4 [Member] | Swap [Member]
Open Costless Collar Contracts For Natural Gas
Calculation Period	01/01/2014 - 12/31/2014
Notional Quantity	41,000
Commodity Fixed Price	2.000