Assets Held For Sale And Discontinued Operations (Schedule Of The Amounts In Net Loss From Discontinued Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Assets Held For Sale And Discontinued Operations [Abstract]
Revenues	$ 8	$ 8	$ 17	$ 12
Production costs and taxes	(67)	(72)	(139)	(166)
Depreciation, depletion, and amortization		(44)		(88)
Deferred income tax benefit	26	43	48	96
(Loss) from discontinued operations, net of income tax benefit	$ (33)	$ (65)	$ (74)	$ (146)