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Supplemental Oil And Gas Information (Schedule Of Results Of Operations From Oil And Gas Producing Activities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Supplemental Oil And Gas Information [Abstract]
Revenues	$ 5,631	$ 13,260	$ 15,325
Production costs and taxes	(3,360)	(4,876)	(4,854)
Depreciation, depletion and amortization	(2,538)	(2,766)	(2,606)
Impairment	(14,526)
Income (loss) from oil and gas producing activities	$ (14,793)	$ 5,618	$ 7,865

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Supplemental Oil And Gas Information [Abstract]

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No definition available.

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Depreciation, depletion and amortization, and valuation provisions (impairments) related to oil and gas producing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 23
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62136-109447

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Other costs for oil and gas producing activities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
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-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62136-109447

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Costs related to the impairment of oil and gas properties.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-10.(c)(3)(ii)(A)(1))
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The results of operations for oil and gas producing activities, excluding corporate overhead and interest costs.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 26
-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62299-109447

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Total revenues from oil and gas producing activities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 23
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62136-109447

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