Derivatives (Schedule Of Subsequent Non-designated Hedges) (Details) - Subsequent to December 31, 2015 - Natural gas - If Nymex - Swap	2 Months Ended
	Feb. 25, 2016 $ / Unit MMBTU
Feb'16 - Dec'16
Derivative Instruments, Gain (Loss) [Line Items]
Non Designated Derivative Instrument Weighted Average Fixed Price For Swaps | $ / Unit	2.495
Hedged Volume (MMBtu/day) | MMBTU	10,000
Jan'17 - Dec'17
Derivative Instruments, Gain (Loss) [Line Items]
Non Designated Derivative Instrument Weighted Average Fixed Price For Swaps | $ / Unit	2.795
Hedged Volume (MMBtu/day) | MMBTU	10,000