Quarterly report pursuant to Section 13 or 15(d)

Dispositions (Summarized Results Of Discontinued Operations) (Details)

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Dispositions (Summarized Results Of Discontinued Operations) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Loss from discontinued operations $ (343) $ (168) $ (395) $ (344)
Discontinued Operations [Member] | Joint Operating With Republic Of Angola [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
General and administrative expense 332 167 364 338
Total operating costs and expenses 332 167 364 338
Operating loss (332) (167) (364) (338)
Other, net (11) (1) (31) (3)
Total other expense (11) (1) (31) (3)
Loss from discontinued operations before income taxes (343) (168) (395) (341)
Income tax expense       3
Loss from discontinued operations $ (343) $ (168) $ (395) $ (344)