Summary Of Significant Accounting Policies (Summary Of Derivative Instruments Contracts) (Details)	Sep. 30, 2013 Natural Gas Fixed Price Swaps [Member] Fixed Price Five [Member] MMBTU	Sep. 30, 2013 Natural Gas Fixed Price Swaps [Member] Fixed Price Six [Member] MMBTU	Sep. 30, 2013 Natural Gas Fixed Price Swaps [Member] Fixed Price Seven [Member] MMBTU	Sep. 30, 2013 Natural Gas Fixed Price Swaps [Member] Fixed Price Eight [Member] MMBTU	Sep. 30, 2012 Natural Gas Basis Protection Swaps [Member] Fixed Price One [Member] MMBTU	Sep. 30, 2012 Natural Gas Basis Protection Swaps [Member] Fixed Price Two [Member] MMBTU	Sep. 30, 2012 Natural Gas Basis Protection Swaps [Member] Fixed Price Three [Member] MMBTU	Sep. 30, 2012 Natural Gas Basis Protection Swaps [Member] Fixed Price Four [Member] MMBTU	Sep. 30, 2013 Natural Gas Costless Collars [Member] Fixed Price One [Member] MMBTU	Sep. 30, 2013 Natural Gas Costless Collars [Member] Fixed Price Two [Member] MMBTU	Sep. 30, 2013 Natural Gas Costless Collars [Member] Fixed Price Three [Member] MMBTU	Sep. 30, 2013 Natural Gas Costless Collars [Member] Fixed Price Four [Member] MMBTU	Sep. 30, 2012 Natural Gas Costless Collars [Member] Fixed Price Five [Member] MMBTU	Sep. 30, 2012 Natural Gas Costless Collars [Member] Fixed Price Six [Member] MMBTU	Sep. 30, 2012 Natural Gas Costless Collars [Member] Fixed Price Seven [Member] MMBTU	Sep. 30, 2012 Natural Gas Costless Collars [Member] Fixed Price Eight [Member] MMBTU	Sep. 30, 2012 Natural Gas Costless Collars [Member] Fixed Price Nine [Member] MMBTU	Sep. 30, 2012 Natural Gas Costless Collars [Member] Fixed Price Ten [Member] MMBTU	Sep. 30, 2012 Natural Gas Costless Collars [Member] Fixed Price Eleven [Member] MMBTU	Sep. 30, 2012 Natural Gas Costless Collars [Member] Fixed Price Twelve [Member] MMBTU	Sep. 30, 2012 Natural Gas Costless Collars [Member] Fixed Price Thirteen [Member] MMBTU	Sep. 30, 2012 Natural Gas Costless Collars [Member] Fixed Price Fourteen [Member] MMBTU	Sep. 30, 2013 Oil costless collars [Member] Fixed Price Nine [Member] bbl	Sep. 30, 2013 Oil costless collars [Member] Fixed Price Ten [Member] bbl	Sep. 30, 2013 Oil costless collars [Member] Fixed Price Eleven [Member] bbl	Sep. 30, 2013 Oil costless collars [Member] Fixed Price Twelve [Member] bbl	Sep. 30, 2012 Oil costless collars [Member] Fixed Price Fifteen [Member] bbl	Sep. 30, 2012 Oil costless collars [Member] Fixed Price Sixteen [Member] bbl	Sep. 30, 2012 Oil costless collars [Member] Fixed Price Seventeen [Member] bbl	Sep. 30, 2013 Oil Fixed Price Swaps [Member] Fixed Price Thirteen [Member] bbl	Sep. 30, 2013 Minimum [Member] Natural Gas Costless Collars [Member] Fixed Price One [Member]	Sep. 30, 2013 Minimum [Member] Natural Gas Costless Collars [Member] Fixed Price Two [Member]	Sep. 30, 2013 Minimum [Member] Natural Gas Costless Collars [Member] Fixed Price Three [Member]	Sep. 30, 2013 Minimum [Member] Natural Gas Costless Collars [Member] Fixed Price Four [Member]	Sep. 30, 2012 Minimum [Member] Natural Gas Costless Collars [Member] Fixed Price Five [Member]	Sep. 30, 2012 Minimum [Member] Natural Gas Costless Collars [Member] Fixed Price Six [Member]	Sep. 30, 2012 Minimum [Member] Natural Gas Costless Collars [Member] Fixed Price Seven [Member]	Sep. 30, 2012 Minimum [Member] Natural Gas Costless Collars [Member] Fixed Price Eight [Member]	Sep. 30, 2012 Minimum [Member] Natural Gas Costless Collars [Member] Fixed Price Nine [Member]	Sep. 30, 2012 Minimum [Member] Natural Gas Costless Collars [Member] Fixed Price Ten [Member]	Sep. 30, 2012 Minimum [Member] Natural Gas Costless Collars [Member] Fixed Price Eleven [Member]	Sep. 30, 2012 Minimum [Member] Natural Gas Costless Collars [Member] Fixed Price Twelve [Member]	Sep. 30, 2012 Minimum [Member] Natural Gas Costless Collars [Member] Fixed Price Thirteen [Member]	Sep. 30, 2012 Minimum [Member] Natural Gas Costless Collars [Member] Fixed Price Fourteen [Member]	Sep. 30, 2013 Minimum [Member] Oil costless collars [Member] Fixed Price Nine [Member]	Sep. 30, 2013 Minimum [Member] Oil costless collars [Member] Fixed Price Ten [Member]	Sep. 30, 2013 Minimum [Member] Oil costless collars [Member] Fixed Price Eleven [Member]	Sep. 30, 2013 Minimum [Member] Oil costless collars [Member] Fixed Price Twelve [Member]	Sep. 30, 2012 Minimum [Member] Oil costless collars [Member] Fixed Price Fifteen [Member]	Sep. 30, 2012 Minimum [Member] Oil costless collars [Member] Fixed Price Sixteen [Member]	Sep. 30, 2012 Minimum [Member] Oil costless collars [Member] Fixed Price Seventeen [Member]	Sep. 30, 2013 Maximum [Member] Natural Gas Costless Collars [Member] Fixed Price One [Member]	Sep. 30, 2013 Maximum [Member] Natural Gas Costless Collars [Member] Fixed Price Two [Member]	Sep. 30, 2013 Maximum [Member] Natural Gas Costless Collars [Member] Fixed Price Three [Member]	Sep. 30, 2013 Maximum [Member] Natural Gas Costless Collars [Member] Fixed Price Four [Member]	Sep. 30, 2012 Maximum [Member] Natural Gas Costless Collars [Member] Fixed Price Five [Member]	Sep. 30, 2012 Maximum [Member] Natural Gas Costless Collars [Member] Fixed Price Six [Member]	Sep. 30, 2012 Maximum [Member] Natural Gas Costless Collars [Member] Fixed Price Seven [Member]	Sep. 30, 2012 Maximum [Member] Natural Gas Costless Collars [Member] Fixed Price Eight [Member]	Sep. 30, 2012 Maximum [Member] Natural Gas Costless Collars [Member] Fixed Price Nine [Member]	Sep. 30, 2012 Maximum [Member] Natural Gas Costless Collars [Member] Fixed Price Ten [Member]	Sep. 30, 2012 Maximum [Member] Natural Gas Costless Collars [Member] Fixed Price Eleven [Member]	Sep. 30, 2012 Maximum [Member] Natural Gas Costless Collars [Member] Fixed Price Twelve [Member]	Sep. 30, 2012 Maximum [Member] Natural Gas Costless Collars [Member] Fixed Price Thirteen [Member]	Sep. 30, 2012 Maximum [Member] Natural Gas Costless Collars [Member] Fixed Price Fourteen [Member]	Sep. 30, 2013 Maximum [Member] Oil costless collars [Member] Fixed Price Nine [Member]	Sep. 30, 2013 Maximum [Member] Oil costless collars [Member] Fixed Price Ten [Member]	Sep. 30, 2013 Maximum [Member] Oil costless collars [Member] Fixed Price Eleven [Member]	Sep. 30, 2013 Maximum [Member] Oil costless collars [Member] Fixed Price Twelve [Member]	Sep. 30, 2012 Maximum [Member] Oil costless collars [Member] Fixed Price Fifteen [Member]	Sep. 30, 2012 Maximum [Member] Oil costless collars [Member] Fixed Price Sixteen [Member]	Sep. 30, 2012 Maximum [Member] Oil costless collars [Member] Fixed Price Seventeen [Member]
Derivative [Line Items]
Production volume covered per month	100,000	70,000	40,000	100,000	50,000	40,000	50,000	50,000	80,000	50,000	100,000	160,000	50,000	120,000	60,000	50,000	50,000	50,000	50,000	150,000	150,000	50,000
Production volume covered per month - Oil costless collars																							3,000	4,000	2,000	4,000	2,000	3,000	2,000	4,000
Fixed price	3.505	3.400	3.655	4.320	0.29	0.30	0.29	0.30																						105.250	3.75	3.75	3.75	4.00	2.50	2.50	2.50	2.50	2.50	2.50	2.50	3.00	3.00	3.00	90.00	90.00	90.00	90.00	90	90	90	4.25	4.30	4.05	4.55	3.25	3.10	3.20	3.20	3.45	3.30	3.30	3.70	3.70	3.65	102.00	101.50	97.50	101.50	105	110	114