Quarterly report pursuant to Section 13 or 15(d)

Dispositions (Assets and Liabilities Attributable to Discontinued Operations) (Details)

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Dispositions (Assets and Liabilities Attributable to Discontinued Operations) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Total current assets   $ 3,290
Total current liabilities $ 326 15,245
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
Total current assets   3,290
Total assets   3,290
Accounts payable   73
Accrued liabilities and other 326 15,172
Total current liabilities 326 15,245
Total liabilities $ 326 $ 15,245