Supplementary Oil And Natural Gas Disclosures (Unaudited) (Schedule Of Drilling Activity) (Details) - item	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Exploratory Wells Drilled
Exploratory wells productive, gross	0	0
Exploratory wells non-productive, gross	0	0
Exploratory wells productive and non-productive, gross	0	0
Exploratory wells productive, net	0	0
Exploratory wells non-productive, net	0	0
Exploratory wells productive and non-productive, net	0
Development Wells Drilled
Total Development Wells Net	1.02	1.53
Non-Productive Development Wells Net	0.51	0.51
Productive Development Wells Net	0.51	1.02
Total Development Wells Gross	2.00	3.00
Non-Productive Development Wells Gross	1.00	1.00
Productive Development Wells Gross	1.00	2.00