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Accrued Liabilities and Other (Schedule of Accrued Liabilities and Other Balances) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Accrued Liabilities and Other [Abstract] |  |
Accrued accounts payable invoices | $ 4,070 | $ 4,650
Joint venture audit settlement |  | 3,322
Gabon DMO, PID and PIH obligations | 3,960 | 3,314
Capital expenditures | 435 | 11,792
Stock appreciation rights - current portion | 2,289 | 2,638
Accrued wages and other compensation | 2,108 | 1,731
Other | 4,322 | 2,326
Total accrued liabilities and other | $ 17,184 | $ 29,773

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