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
Jun. 30, 2017
Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Total current assets $ 2,578 $ 2,139
Total current liabilities 15,186 18,452
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 2,578 2,139
Total current assets 2,578 2,139
Total assets 2,578 2,139
Accounts payable 10 77
Foreign taxes payable   3,078
Accrued liabilities and other 15,176 15,297
Total current liabilities 15,186 18,452
Total liabilities $ 15,186 $ 18,452