Supplemental Oil And Gas Information (Schedule Of Results Of Operations From Oil And Gas Producing Activities) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Supplemental Oil And Gas Information [Abstract]
Revenues	$ 15,325	$ 19,885	$ 16,862
Production costs and taxes	(4,854)	(5,610)	(5,310)
Depreciation, depletion and amortization	(2,606)	(3,044)	(2,195)
Income from oil and gas producing activities	$ 7,865	$ 11,231	$ 9,357