Hedging Activities (Schedule Of Derivative Instruments) (Details)	Dec. 31, 2013
Fixed Price Swap, Period of January through March 2014 [Member]
Derivative [Line Items]
Daily Volume	4,000
Weighted Average Price	104.75
Fixed Price Swap, Period of April through December 2014 [Member]
Derivative [Line Items]
Daily Volume	2,000
Weighted Average Price	101.50
Fixed Price Swap, January 2014 [Member]
Derivative [Line Items]
Daily Volume	65,000
Weighted Average Price	4.04
Fixed Price Swap, February Though December 2014 [Member]
Derivative [Line Items]
Daily Volume	105,000
Weighted Average Price	4.01
Fixed Price Swap, January through December 2015 [Member]
Derivative [Line Items]
Daily Volume	125,000
Weighted Average Price	4.03
Fixed Price Swap, Period of January through March 2016 [Member]
Derivative [Line Items]
Daily Volume	105,000
Weighted Average Price	4.04
Fixed Price Swap, April 2016 [Member]
Derivative [Line Items]
Daily Volume	95,000
Weighted Average Price	4.04