Annual report pursuant to Section 13 and 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
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Total current assets $ 3,290 $ 3,222 $ 2,836
Total current liabilities 15,245 $ 15,191 15,347
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 joint venture owners 3,290   2,836
Total current assets 3,290   2,836
Total assets 3,290   2,836
Accounts payable 73   158
Accrued liabilities and other 15,172   15,189
Total current liabilities 15,245   15,347
Total liabilities $ 15,245   $ 15,347