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
Mar. 31, 2020
Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Total current liabilities $ 395 $ 350
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 payable 16 8
Accrued liabilities and other 379 342
Total current liabilities 395 350
Total liabilities $ 395 $ 350