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Accrued Liabilities and Other (Schedule of Accrued Liabilities and Other Balances) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Accrued Liabilities and Other [Abstract] |  |
Accrued accounts payable invoices | $ 4,650 | $ 4,669
Joint venture audit settlement | 3,322 |
Gabon DMO, PID and PIH obligations | 3,314 | 3,145
Capital expenditures | 11,792 | 2,038
Stock appreciation rights | 2,638 | 1,007
Accrued wages and other compensation | 1,731 | 1,802
Other | 2,326 | 1,477
Total accrued liabilities and other | $ 29,773 | $ 14,138

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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements payable within one year (or the operating cycle, if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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