Discontinued Operations (Schedule Of The Amounts In Net Loss From Discontinued Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Discontinued Operations [Abstract]
Revenues					$ 22	$ 30
Production costs and taxes					(164)	(315)
Depreciation, depletion, and amortization						(223)
Impairment						(5,242)
Gain on sale of assets					128
Deferred income tax benefit					(180)	1,419
Current income tax benefit					57	20
Net loss from discontinued operations, net of income tax	$ (9)	$ (54)	$ (33)	$ (41)	$ (137)	$ (4,311)