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Discontinued Operations (Schedule Of The Amounts In Net Loss From Discontinued Operations) (Details) - USD ($)
$ in Thousands
3 Months Ended
Jan. 26, 2018
Mar. 31, 2019
Mar. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net income from discontinued operations     $ 1,110
Sale of methane facility assets $ 2,650    
Discontinued Operations [Member] | Methane Facilities [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Revenues   6
Production costs and taxes   (50)
Depreciation, depletion, and amortization   (4)
Interest income   1
Gain on sale of assets   1,157
Net income from discontinued operations   $ 1,110