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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Income (loss) from discontinued operations $ (15,783) $ 853 $ (7,997) $ (27,831)
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]        
Exploration expense 15,269 32 15,270 27,878
Depreciation, depletion and amortization 3 3 9 9
General and administrative expense 400 1,135 994 2,127
Bad debt expense (recovery) and other     (7,629)  
Total operating costs and expenses 15,672 1,170 8,644 30,014
Other operating income (loss), net (7)   (28)  
Operating income (loss) (15,679) (1,170) (8,672) (30,014)
Interest income     3,201  
Other, net 6 2,023 551 2,183
Total other income 6 2,023 3,752 2,183
Income (loss) from discontinued operations before income taxes (15,673) 853 (4,920) (27,831)
Income tax expense 110   3,077  
Income (loss) from discontinued operations $ (15,783) $ 853 $ (7,997) $ (27,831)