Quarterly report pursuant to Section 13 or 15(d)

Acquisitions And Dispositions (Assets And Liabilities Attributable To Discontinued Operations) (Details)

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Acquisitions And Dispositions (Assets And Liabilities Attributable To Discontinued Operations) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Total current assets $ 1,747 $ 8,369
Total current liabilities 18,656 4,129
Joint Operating With Republic Of Angola [Member] | Discontinued Operations [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Accounts with partners 1,723 8,091
Prepayments and other 24 278
Total current assets 1,747 8,369
Equipment and other   143
Property and equipment-successful efforts method   143
Accumulated depreciation, depletion, amortization and impairment   (127)
Net property and equipment   16
Total assets 1,747 8,385
Accounts payable 104 2,708
Foreign taxes payable 3,077  
Accrued liabilities and other 15,475 1,421
Total current liabilities $ 18,656 $ 4,129