Quarterly report pursuant to Section 13 or 15(d)

Acquisitions And Dispositions (Summarized Results Of Discontinued Operations) (Details)

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Acquisitions And Dispositions (Summarized Results Of Discontinued Operations) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Income (loss) from discontinued operations $ (168) $ (20) $ (344) $ 7,786
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]        
Depreciation, depletion and amortization   3   6
General and administrative expense 167 296 338 594
Bad debt expense (recovery) and other       (7,628)
Total operating costs, expenses and (recovery) 167 299 338 (7,028)
Other operating loss, net       (21)
Operating income (loss) (167) (299) (338) 7,007
Interest income       3,201
Other, net (1) 279 (3) 545
Total other income (1) 279 (3) 3,746
Income (loss) from discontinued operations before income taxes (168) (20) (341) 10,753
Income tax expense     3 2,967
Income (loss) from discontinued operations $ (168) $ (20) $ (344) $ 7,786