Derivatives And Fair Value Measurements (Price Collars And Swaps For Anticipated Natural Gas And NGL Production) (Details)	9 Months Ended
	Sep. 30, 2014 MMcf
Credit Risk Derivatives, at Fair Value, Net [Abstract]
Gas 2014, MMcfd	170
Gas 2015, MMcfd	150
Gas 2016-2021, MMcfd	40
Anticipated Natural Gas Basis Swap Production For 2014	40
Anticipated Natural Gas Basis Swap Production For 2015	0
Anticipated Natural Gas Basis Swap Production for 2016-2021	0